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engine88.pas
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unit engine88;
interface
uses
sysutils, ptccrt, ptcgraph;
const
maxdepth = 40;
maxmoves = 200;
files = 8;
ranks = 8;
type
positiontype = array[1..files, 1..ranks] of shortint;
movetype = record
file1, rank1, file2, rank2, degree: shortint;
end;
var
position: positiontype;
legals: array[1..maxdepth + 1] of integer;
beta: array[1..maxdepth + 1] of integer;
enpassant: array[1..maxdepth + 1] of shortint;
legmvs: array[1..maxdepth + 1, 1..maxmoves] of movetype;
best2: array[1..maxmoves] of movetype;
bonuses, movescores: array[1..maxmoves] of integer;
lmoved, bpwns, wpwns: array[1..8] of shortint;
killer, killer2: array[2..maxdepth] of movetype;
bigs, storesc, searchdepth, mcount, rrate, hyva, huonoja,
viimeksi, wmat, bmat, bonus, movesmade, posvalue: integer;
kpos, positions, pos2: longint;
mwk, mbk, mwra, mbra, mwrh, mbrh, viewscores, analysis,
keskeyta, opening, stopcalc: boolean;
replystr, kpstr, beststr, lstr, destr, cstr, mstr: string;
wkx, wky, bkx, bky: shortint;
chi: char;
ho2, mi2, se2, hu2, ho1, mi1, se1, hu1: word;
sekunnit, smax: longint;
procedure searchlegmvs(forwhite: boolean; depth: integer);
procedure compute(forwhite: boolean; var bestmove: movetype; var score: integer;
seconds: longint);
implementation
{$I colors4}
procedure gettime(var hour, minute, second, sec100: word);
var
millisecond: word;
begin
decodetime(time, hour, minute, second, millisecond);
sec100 := millisecond div 10;
end;
procedure searchlegmvs(forwhite: boolean; depth: integer);
var x1, y1, moved, taken: shortint; ep, nopossiblechecks, incheck: boolean;
procedure makemove(x2, y2: shortint);
begin
moved := position[x1, y1];
taken := position[x2, y2];
position[x1, y1] := 0;
position[x2, y2] := moved;
if (ep) then position[x2, y1] := 0;
if (moved > 0) then begin
if (moved = 1) then begin
wkx := x2; wky := y2;
if (x2 = x1 + 2) then begin
position[8, 1] := 0; position[6, 1] := 3
end
else if (x2 = x1 - 2) then begin
position[1, 1] := 0; position[4, 1] := 3
end
end
else if ((moved = 6) and (y2 = ranks)) then position[x2, y2] := 2
end
else begin
if (moved = -1) then begin
bkx := x2; bky := y2;
if (x2 = x1 + 2) then begin
position[8, 8] := 0; position[6, 8] := -3
end
else if (x2 = x1 - 2) then begin
position[1, 8] := 0; position[4, 8] := -3
end
end
else if ((moved = -6) and (y2 = 1)) then position[x2, y2] := -2
end
end;
procedure unmakemv(x2, y2: shortint);
begin
position[x1, y1] := moved;
position[x2, y2] := taken;
if (moved > 0) then begin
if (ep) then position[x2, y1] := -6
else if (moved = 1) then begin
wkx := x1; wky := y1;
if (x2 = x1 + 2) then begin
position[8, 1] := 3; position[6, 1] := 0
end
else if (x2 = x1 - 2) then begin
position[1, 1] := 3; position[4, 1] := 0
end
end
end
else begin
if (ep) then position[x2, y1] := 6
else if (moved = -1) then begin
bkx := x1; bky := y1;
if (x2 = x1 + 2) then begin
position[8, 8] := -3; position[6, 8] := 0
end
else if (x2 = x1 - 2) then begin
position[1, 8] := -3; position[4, 8] := 0
end
end
end
end;
function kingincheck: boolean;
var xx, yy: shortint;
label 111, 222;
begin
kingincheck := false;
if (forwhite) then begin
if ((wkx > 1) and (wky > 1)) then
if (position[wkx - 1, wky - 1] = -1) then goto 111;
if (wkx > 1) then
if (position[wkx - 1, wky] = -1) then goto 111;
if (wkx < files) then
if (position[wkx + 1, wky] = -1) then goto 111;
if (wky > 1) then
if (position[wkx, wky - 1] = -1) then goto 111;
if (wky < ranks) then
if (position[wkx, wky + 1] = -1) then goto 111;
if ((wkx < files) and (wky < ranks)) then begin
if (position[wkx + 1, wky + 1] = -6) then goto 111;
if (position[wkx + 1, wky + 1] = -1) then goto 111
end;
if ((wkx < files) and (wky > 1)) then
if (position[wkx + 1, wky - 1] = -1) then goto 111;
if ((wkx > 1) and (wky < ranks)) then begin
if (position[wkx - 1, wky + 1] = -6) then goto 111;
if (position[wkx - 1, wky + 1] = -1) then goto 111
end;
if ((wkx > 2) and (wky < ranks)) then
if (position[wkx - 2, wky + 1] = -5) then goto 111;
if ((wkx > 2) and (wky > 1)) then
if (position[wkx - 2, wky - 1] = -5) then goto 111;
if ((wkx < files - 1) and (wky < ranks)) then
if (position[wkx + 2, wky + 1] = -5) then goto 111;
if ((wkx < files - 1) and (wky > 1)) then
if (position[wkx + 2, wky - 1] = -5) then goto 111;
if ((wkx < files) and (wky > 2)) then
if (position[wkx + 1, wky - 2] = -5) then goto 111;
if ((wkx > 1) and (wky > 2)) then
if (position[wkx - 1, wky - 2] = -5) then goto 111;
if ((wkx < files) and (wky < ranks - 1)) then
if (position[wkx + 1, wky + 2] = -5) then goto 111;
if ((wkx > 1) and (wky < ranks - 1)) then
if (position[wkx - 1, wky + 2] = -5) then goto 111;
xx := wkx; yy := wky;
repeat
if (yy < ranks) then if (position[xx, yy + 1] = 0) then yy := yy + 1;
until ((yy = ranks) or (position[xx, yy + 1] <> 0));
if (yy < ranks) then
if ((position[xx, yy + 1] = -2) or (position[xx, yy + 1] = -3)) then goto 111;
xx := wkx; yy := wky;
repeat
if (yy > 1) then if (position[xx, yy - 1] = 0) then yy := yy - 1;
until ((yy = 1) or (position[xx, yy - 1] <> 0));
if (yy > 1) then
if ((position[xx, yy - 1] = -2) or (position[xx, yy - 1] = -3)) then goto 111;
xx := wkx; yy := wky;
repeat
if (xx < files) then if (position[xx + 1, yy] = 0) then xx := xx + 1;
until ((xx = files) or (position[xx + 1, yy] <> 0));
if (xx < files) then
if ((position[xx + 1, yy] = -2) or (position[xx + 1, yy] = -3)) then goto 111;
xx := wkx; yy := wky;
repeat
if (xx > 1) then if (position[xx - 1, yy] = 0) then xx := xx - 1;
until ((xx = 1) or (position[xx - 1, yy] <> 0));
if (xx > 1) then
if ((position[xx - 1, yy] = -2) or (position[xx - 1, yy] = -3)) then goto 111;
xx := wkx; yy := wky;
repeat
if ((xx > 1) and (yy > 1)) then if (position[xx - 1, yy - 1] = 0) then begin
xx := xx - 1; yy := yy - 1;
end;
until ((xx = 1) or (yy = 1) or (position[xx - 1, yy - 1] <> 0));
if ((xx > 1) and (yy > 1)) then
if ((position[xx - 1, yy - 1] = -2) or (position[xx - 1, yy - 1] = -4)) then goto 111;
xx := wkx; yy := wky;
repeat
if ((xx > 1) and (yy < ranks)) then if (position[xx - 1, yy + 1] = 0) then begin
xx := xx - 1; yy := yy + 1;
end;
until ((xx = 1) or (yy = ranks) or (position[xx - 1, yy + 1] <> 0));
if ((xx > 1) and (yy < ranks)) then
if ((position[xx - 1, yy + 1] = -2) or (position[xx - 1, yy + 1] = -4)) then goto 111;
xx := wkx; yy := wky;
repeat
if ((xx < files) and (yy > 1)) then if (position[xx + 1, yy - 1] = 0) then begin
xx := xx + 1; yy := yy - 1;
end;
until ((xx = files) or (yy = 1) or (position[xx + 1, yy - 1] <> 0));
if ((xx < files) and (yy > 1)) then
if ((position[xx + 1, yy - 1] = -2) or (position[xx + 1, yy - 1] = -4)) then goto 111;
xx := wkx; yy := wky;
repeat
if ((xx < files) and (yy < ranks)) then if (position[xx + 1, yy + 1] = 0) then
begin
xx := xx + 1; yy := yy + 1;
end;
until ((xx = files) or (yy = ranks) or (position[xx + 1, yy + 1] <> 0));
if ((xx < files) and (yy < ranks)) then
if ((position[xx + 1, yy + 1] = -2) or (position[xx + 1, yy + 1] = -4)) then goto 111;
end
else begin
if ((bkx > 1) and (bky > 1)) then begin
if (position[bkx - 1, bky - 1] = 1) then goto 111;
if (position[bkx - 1, bky - 1] = 6) then goto 111;
end;
if (bkx > 1) then
if (position[bkx - 1, bky] = 1) then goto 111;
if (bkx < files) then
if (position[bkx + 1, bky] = 1) then goto 111;
if (bky > 1) then
if (position[bkx, bky - 1] = 1) then goto 111;
if (bky < ranks) then
if (position[bkx, bky + 1] = 1) then goto 111;
if ((bkx < files) and (bky < ranks)) then
if (position[bkx + 1, bky + 1] = 1) then goto 111;
if ((bkx < files) and (bky > 1)) then begin
if (position[bkx + 1, bky - 1] = 1) then goto 111;
if (position[bkx + 1, bky - 1] = 6) then goto 111;
end;
if ((bkx > 1) and (bky < ranks)) then
if (position[bkx - 1, bky + 1] = 1) then goto 111;
if ((bkx > 2) and (bky < ranks)) then
if (position[bkx - 2, bky + 1] = 5) then goto 111;
if ((bkx > 2) and (bky > 1)) then
if (position[bkx - 2, bky - 1] = 5) then goto 111;
if ((bkx < files - 1) and (bky < ranks)) then
if (position[bkx + 2, bky + 1] = 5) then goto 111;
if ((bkx < files - 1) and (bky > 1)) then
if (position[bkx + 2, bky - 1] = 5) then goto 111;
if ((bkx < files) and (bky > 2)) then
if (position[bkx + 1, bky - 2] = 5) then goto 111;
if ((bkx > 1) and (bky > 2)) then
if (position[bkx - 1, bky - 2] = 5) then goto 111;
if ((bkx < files) and (bky < ranks - 1)) then
if (position[bkx + 1, bky + 2] = 5) then goto 111;
if ((bkx > 1) and (bky < ranks - 1)) then
if (position[bkx - 1, bky + 2] = 5) then goto 111;
xx := bkx; yy := bky;
repeat
if (yy < ranks) then if (position[xx, yy + 1] = 0) then yy := yy + 1;
until ((yy = ranks) or (position[xx, yy + 1] <> 0));
if (yy < ranks) then
if ((position[xx, yy + 1] = 2) or (position[xx, yy + 1] = 3)) then goto 111;
xx := bkx; yy := bky;
repeat
if (yy > 1) then if (position[xx, yy - 1] = 0) then yy := yy - 1;
until ((yy = 1) or (position[xx, yy - 1] <> 0));
if (yy > 1) then
if ((position[xx, yy - 1] = 2) or (position[xx, yy - 1] = 3)) then goto 111;
xx := bkx; yy := bky;
repeat
if (xx < files) then if (position[xx + 1, yy] = 0) then xx := xx + 1;
until ((xx = files) or (position[xx + 1, yy] <> 0));
if (xx < files) then
if ((position[xx + 1, yy] = 2) or (position[xx + 1, yy] = 3)) then goto 111;
xx := bkx; yy := bky;
repeat
if (xx > 1) then if (position[xx - 1, yy] = 0) then xx := xx - 1;
until ((xx = 1) or (position[xx - 1, yy] <> 0));
if (xx > 1) then
if ((position[xx - 1, yy] = 2) or (position[xx - 1, yy] = 3)) then goto 111;
xx := bkx; yy := bky;
repeat
if ((xx > 1) and (yy > 1)) then if (position[xx - 1, yy - 1] = 0) then begin
xx := xx - 1; yy := yy - 1;
end;
until ((xx = 1) or (yy = 1) or (position[xx - 1, yy - 1] <> 0));
if ((xx > 1) and (yy > 1)) then
if ((position[xx - 1, yy - 1] = 2) or (position[xx - 1, yy - 1] = 4)) then goto 111;
xx := bkx; yy := bky;
repeat
if ((xx > 1) and (yy < ranks)) then if (position[xx - 1, yy + 1] = 0) then begin
xx := xx - 1; yy := yy + 1;
end;
until ((xx = 1) or (yy = ranks) or (position[xx - 1, yy + 1] <> 0));
if ((xx > 1) and (yy < ranks)) then
if ((position[xx - 1, yy + 1] = 2) or (position[xx - 1, yy + 1] = 4)) then goto 111;
xx := bkx; yy := bky;
repeat
if ((xx < files) and (yy > 1)) then if (position[xx + 1, yy - 1] = 0) then begin
xx := xx + 1; yy := yy - 1;
end;
until ((xx = files) or (yy = 1) or (position[xx + 1, yy - 1] <> 0));
if ((xx < files) and (yy > 1)) then
if ((position[xx + 1, yy - 1] = 2) or (position[xx + 1, yy - 1] = 4)) then goto 111;
xx := bkx; yy := bky;
repeat
if ((xx < files) and (yy < ranks)) then if (position[xx + 1, yy + 1] = 0) then
begin
xx := xx + 1; yy := yy + 1;
end;
until ((xx = files) or (yy = ranks) or (position[xx + 1, yy + 1] <> 0));
if ((xx < files) and (yy < ranks)) then
if ((position[xx + 1, yy + 1] = 2) or (position[xx + 1, yy + 1] = 4)) then goto 111;
end;
goto 222;
111: kingincheck := true;
222:
end;
procedure checkleg(x2, y2: shortint);
var islegal: boolean;
begin
makemove(x2, y2);
islegal := ((nopossiblechecks) and (abs(moved) > 1));
if (not islegal) then islegal := (not kingincheck);
if (islegal) then begin
if (legals[depth] < maxmoves) then begin
legals[depth] := legals[depth] + 1;
legmvs[depth, legals[depth]].file1 := x1;
legmvs[depth, legals[depth]].rank1 := y1;
legmvs[depth, legals[depth]].file2 := x2;
legmvs[depth, legals[depth]].rank2 := y2;
if (taken = 0) then legmvs[depth, legals[depth]].degree := 3
else if (abs(taken) < abs(moved)) then
legmvs[depth, legals[depth]].degree := 1
else legmvs[depth, legals[depth]].degree := 2;
if (ep) then legmvs[depth, legals[depth]].degree := 2;
if ((moved = 6) and (y2 = ranks))
then legmvs[depth, legals[depth]].degree := 1;
if ((moved = -6) and (y2 = 1))
then legmvs[depth, legals[depth]].degree := 1;
end;
end;
unmakemv(x2, y2)
end;
procedure blackknight;
begin
if ((x1 < files) and (y1 < ranks - 1) and (position[x1 + 1, y1 + 2] > -1))
then checkleg(x1 + 1, y1 + 2);
if ((x1 < files) and (y1 > 2) and (position[x1 + 1, y1 - 2] > -1))
then checkleg(x1 + 1, y1 - 2);
if ((x1 > 1) and (y1 < ranks - 1) and (position[x1 - 1, y1 + 2] > -1))
then checkleg(x1 - 1, y1 + 2);
if ((x1 > 1) and (y1 > 2) and (position[x1 - 1, y1 - 2] > -1))
then checkleg(x1 - 1, y1 - 2);
if ((x1 < files - 1) and (y1 < ranks) and (position[x1 + 2, y1 + 1] > -1))
then checkleg(x1 + 2, y1 + 1);
if ((x1 < files - 1) and (y1 > 1) and (position[x1 + 2, y1 - 1] > -1))
then checkleg(x1 + 2, y1 - 1);
if ((x1 > 2) and (y1 < ranks) and (position[x1 - 2, y1 + 1] > -1))
then checkleg(x1 - 2, y1 + 1);
if ((x1 > 2) and (y1 > 1) and (position[x1 - 2, y1 - 1] > -1))
then checkleg(x1 - 2, y1 - 1);
end;
procedure blackking;
var nhelp: integer;
begin
if ((x1 < files) and (y1 < ranks) and (position[x1 + 1, y1 + 1] > -1))
then checkleg(x1 + 1, y1 + 1);
if ((x1 < files) and (y1 > 1) and (position[x1 + 1, y1 - 1] > -1))
then checkleg(x1 + 1, y1 - 1);
if ((x1 > 1) and (y1 < ranks) and (position[x1 - 1, y1 + 1] > -1))
then checkleg(x1 - 1, y1 + 1);
if ((x1 > 1) and (y1 > 1) and (position[x1 - 1, y1 - 1] > -1))
then checkleg(x1 - 1, y1 - 1);
nhelp := legals[depth];
if ((x1 < files) and (position[x1 + 1, y1] > -1))
then checkleg(x1 + 1, y1);
if ((x1 = 5) and (y1 = 8) and (legals[depth] > nhelp)) then begin
if ((not mbk) and (not mbrh) and (position[6, 8] = 0)
and (position[8, 8] = -3) and
(position[7, 8] = 0) and (not kingincheck)) then checkleg(x1 + 2, y1)
end;
if ((y1 > 1) and (position[x1, y1 - 1] > -1))
then checkleg(x1, y1 - 1);
if ((y1 < ranks) and (position[x1, y1 + 1] > -1))
then checkleg(x1, y1 + 1);
nhelp := legals[depth];
if ((x1 > 1) and (position[x1 - 1, y1] > -1))
then checkleg(x1 - 1, y1);
if ((x1 = 5) and (y1 = 8) and (legals[depth] > nhelp)) then begin
if ((not mbk) and (not mbra) and (position[4, 8] = 0) and (position[2, 8] = 0)
and (position[1, 8] = -3)
and (position[3, 8] = 0) and (not kingincheck)) then checkleg(x1 - 2, y1)
end;
end;
procedure whiteking;
var nhelp: integer;
begin
if ((x1 < files) and (y1 < ranks) and (position[x1 + 1, y1 + 1] < 1))
then checkleg(x1 + 1, y1 + 1);
if ((x1 < files) and (y1 > 1) and (position[x1 + 1, y1 - 1] < 1))
then checkleg(x1 + 1, y1 - 1);
if ((x1 > 1) and (y1 < ranks) and (position[x1 - 1, y1 + 1] < 1))
then checkleg(x1 - 1, y1 + 1);
if ((x1 > 1) and (y1 > 1) and (position[x1 - 1, y1 - 1] < 1))
then checkleg(x1 - 1, y1 - 1);
nhelp := legals[depth];
if ((x1 < files) and (position[x1 + 1, y1] < 1))
then checkleg(x1 + 1, y1);
if ((x1 = 5) and (y1 = 1) and (legals[depth] > nhelp)) then begin
if ((not mwk) and (not mwrh) and (position[6, 1] = 0)
and (position[8, 1] = 3) and
(position[7, 1] = 0) and (not kingincheck)) then checkleg(x1 + 2, y1)
end;
if ((y1 > 1) and (position[x1, y1 - 1] < 1))
then checkleg(x1, y1 - 1);
if ((y1 < ranks) and (position[x1, y1 + 1] < 1))
then checkleg(x1, y1 + 1);
nhelp := legals[depth];
if ((x1 > 1) and (position[x1 - 1, y1] < 1))
then checkleg(x1 - 1, y1);
if ((x1 = 5) and (y1 = 1) and (legals[depth] > nhelp)) then begin
if ((not mwk) and (not mwra) and (position[4, 1] = 0)
and (position[1, 1] = 3) and (position[3, 1] = 0)
and (position[2, 1] = 0) and (not kingincheck)) then checkleg(x1 - 2, y1)
end;
end;
procedure whitepawn;
begin
if ((x1 < files) and (y1 < ranks) and (position[x1 + 1, y1 + 1] < 0))
then checkleg(x1 + 1, y1 + 1);
if ((x1 > 1) and (y1 < ranks) and (position[x1 - 1, y1 + 1] < 0))
then checkleg(x1 - 1, y1 + 1);
if ((y1 < ranks) and (position[x1, y1 + 1] = 0))
then checkleg(x1, y1 + 1);
if ((y1 = 2) and (position[x1, 3] = 0) and (position[x1, 4] = 0))
then checkleg(x1, 4);
if ((y1 = 5) and (enpassant[depth] = x1 + 1)) then begin
ep := true;
checkleg(x1 + 1, 6);
ep := false
end;
if ((y1 = 5) and (enpassant[depth] = x1 - 1)) then begin
ep := true;
checkleg(x1 - 1, 6);
ep := false
end
end;
procedure blackpawn;
begin
if ((x1 < files) and (y1 > 1) and (position[x1 + 1, y1 - 1] > 0))
then checkleg(x1 + 1, y1 - 1);
if ((x1 > 1) and (y1 > 1) and (position[x1 - 1, y1 - 1] > 0))
then checkleg(x1 - 1, y1 - 1);
if ((y1 > 1) and (position[x1, y1 - 1] = 0))
then checkleg(x1, y1 - 1);
if ((y1 = 7) and (position[x1, 6] = 0) and (position[x1, 5] = 0))
then checkleg(x1, 5);
if ((y1 = 4) and (enpassant[depth] = x1 + 1)) then begin
ep := true;
checkleg(x1 + 1, 3);
ep := false;
end;
if ((y1 = 4) and (enpassant[depth] = x1 - 1)) then begin
ep := true;
checkleg(x1 - 1, 3);
ep := false;
end
end;
procedure whiteknight;
begin
if ((x1 < files) and (y1 < ranks - 1) and (position[x1 + 1, y1 + 2] < 1))
then checkleg(x1 + 1, y1 + 2);
if ((x1 < files) and (y1 > 2) and (position[x1 + 1, y1 - 2] < 1))
then checkleg(x1 + 1, y1 - 2);
if ((x1 > 1) and (y1 < ranks - 1) and (position[x1 - 1, y1 + 2] < 1))
then checkleg(x1 - 1, y1 + 2);
if ((x1 > 1) and (y1 > 2) and (position[x1 - 1, y1 - 2] < 1))
then checkleg(x1 - 1, y1 - 2);
if ((x1 < files - 1) and (y1 < ranks) and (position[x1 + 2, y1 + 1] < 1))
then checkleg(x1 + 2, y1 + 1);
if ((x1 < files - 1) and (y1 > 1) and (position[x1 + 2, y1 - 1] < 1))
then checkleg(x1 + 2, y1 - 1);
if ((x1 > 2) and (y1 < ranks) and (position[x1 - 2, y1 + 1] < 1))
then checkleg(x1 - 2, y1 + 1);
if ((x1 > 2) and (y1 > 1) and (position[x1 - 2, y1 - 1] < 1))
then checkleg(x1 - 2, y1 - 1);
end;
procedure whitequeen;
var xx, yy: shortint;
begin
xx := x1; yy := y1;
repeat
if (yy < ranks) then
if (position[xx, yy + 1] = 0) then begin
yy := yy + 1;
checkleg(xx, yy);
end;
until ((yy = ranks) or (position[xx, yy + 1] <> 0));
if ((yy < ranks) and (position[xx, yy + 1] < 0)) then checkleg(xx, yy + 1);
xx := x1; yy := y1;
repeat
if (yy > 1) then
if (position[xx, yy - 1] = 0) then begin
yy := yy - 1;
checkleg(xx, yy);
end;
until ((yy = 1) or (position[xx, yy - 1] <> 0));
if ((yy > 1) and (position[xx, yy - 1] < 0)) then checkleg(xx, yy - 1);
xx := x1; yy := y1;
repeat
if (xx < files) then
if (position[xx + 1, yy] = 0) then begin
xx := xx + 1;
checkleg(xx, yy);
end;
until ((xx = files) or (position[xx + 1, yy] <> 0));
if ((xx < files) and (position[xx + 1, yy] < 0)) then checkleg(xx + 1, yy);
xx := x1; yy := y1;
repeat
if (xx > 1) then
if (position[xx - 1, yy] = 0) then begin
xx := xx - 1;
checkleg(xx, yy);
end;
until ((xx = 1) or (position[xx - 1, yy] <> 0));
if ((xx > 1) and (position[xx - 1, yy] < 0)) then checkleg(xx - 1, yy);
xx := x1; yy := y1;
repeat
if ((yy < ranks) and (xx < files)) then
if (position[xx + 1, yy + 1] = 0) then begin
yy := yy + 1; xx := xx + 1;
checkleg(xx, yy);
end;
until ((yy = ranks) or (xx = files) or (position[xx + 1, yy + 1] <> 0));
if ((yy < ranks) and (xx < files) and (position[xx + 1, yy + 1] < 0))
then checkleg(xx + 1, yy + 1);
xx := x1; yy := y1;
repeat
if ((yy > 1) and (xx < files)) then
if (position[xx + 1, yy - 1] = 0) then begin
yy := yy - 1; xx := xx + 1;
checkleg(xx, yy);
end;
until ((yy = 1) or (xx = files) or (position[xx + 1, yy - 1] <> 0));
if ((yy > 1) and (xx < files) and (position[xx + 1, yy - 1] < 0))
then checkleg(xx + 1, yy - 1);
xx := x1; yy := y1;
repeat
if ((yy < ranks) and (xx > 1)) then
if (position[xx - 1, yy + 1] = 0) then begin
yy := yy + 1; xx := xx - 1;
checkleg(xx, yy);
end;
until ((yy = ranks) or (xx = 1) or (position[xx - 1, yy + 1] <> 0));
if ((yy < ranks) and (xx > 1) and (position[xx - 1, yy + 1] < 0))
then checkleg(xx - 1, yy + 1);
xx := x1; yy := y1;
repeat
if ((yy > 1) and (xx > 1)) then
if (position[xx - 1, yy - 1] = 0) then begin
yy := yy - 1; xx := xx - 1;
checkleg(xx, yy);
end;
until ((yy = 1) or (xx = 1) or (position[xx - 1, yy - 1] <> 0));
if ((yy > 1) and (xx > 1) and (position[xx - 1, yy - 1] < 0))
then checkleg(xx - 1, yy - 1);
end;
procedure blackqueen;
var xx, yy: shortint;
begin
xx := x1; yy := y1;
repeat
if (yy < ranks) then
if (position[xx, yy + 1] = 0) then begin
yy := yy + 1;
checkleg(xx, yy);
end;
until ((yy = ranks) or (position[xx, yy + 1] <> 0));
if ((yy < ranks) and (position[xx, yy + 1] > 0)) then checkleg(xx, yy + 1);
xx := x1; yy := y1;
repeat
if (yy > 1) then
if (position[xx, yy - 1] = 0) then begin
yy := yy - 1;
checkleg(xx, yy);
end;
until ((yy = 1) or (position[xx, yy - 1] <> 0));
if ((yy > 1) and (position[xx, yy - 1] > 0)) then checkleg(xx, yy - 1);
xx := x1; yy := y1;
repeat
if (xx < files) then
if (position[xx + 1, yy] = 0) then begin
xx := xx + 1;
checkleg(xx, yy);
end;
until ((xx = files) or (position[xx + 1, yy] <> 0));
if ((xx < files) and (position[xx + 1, yy] > 0)) then checkleg(xx + 1, yy);
xx := x1; yy := y1;
repeat
if (xx > 1) then
if (position[xx - 1, yy] = 0) then begin
xx := xx - 1;
checkleg(xx, yy);
end;
until ((xx = 1) or (position[xx - 1, yy] <> 0));
if ((xx > 1) and (position[xx - 1, yy] > 0)) then checkleg(xx - 1, yy);
xx := x1; yy := y1;
repeat
if ((yy < ranks) and (xx < files)) then
if (position[xx + 1, yy + 1] = 0) then begin
yy := yy + 1; xx := xx + 1;
checkleg(xx, yy);
end;
until ((yy = ranks) or (xx = files) or (position[xx + 1, yy + 1] <> 0));
if ((yy < ranks) and (xx < files) and (position[xx + 1, yy + 1] > 0))
then checkleg(xx + 1, yy + 1);
xx := x1; yy := y1;
repeat
if ((yy > 1) and (xx < files)) then
if (position[xx + 1, yy - 1] = 0) then begin
yy := yy - 1; xx := xx + 1;
checkleg(xx, yy);
end;
until ((yy = 1) or (xx = files) or (position[xx + 1, yy - 1] <> 0));
if ((yy > 1) and (xx < files) and (position[xx + 1, yy - 1] > 0))
then checkleg(xx + 1, yy - 1);
xx := x1; yy := y1;
repeat
if ((yy < ranks) and (xx > 1)) then
if (position[xx - 1, yy + 1] = 0) then begin
yy := yy + 1; xx := xx - 1;
checkleg(xx, yy);
end;
until ((yy = ranks) or (xx = 1) or (position[xx - 1, yy + 1] <> 0));
if ((yy < ranks) and (xx > 1) and (position[xx - 1, yy + 1] > 0))
then checkleg(xx - 1, yy + 1);
xx := x1; yy := y1;
repeat
if ((yy > 1) and (xx > 1)) then
if (position[xx - 1, yy - 1] = 0) then begin
yy := yy - 1; xx := xx - 1;
checkleg(xx, yy);
end;
until ((yy = 1) or (xx = 1) or (position[xx - 1, yy - 1] <> 0));
if ((yy > 1) and (xx > 1) and (position[xx - 1, yy - 1] > 0))
then checkleg(xx - 1, yy - 1);
end;
procedure whiterook;
var xx, yy: shortint;
begin
xx := x1; yy := y1;
repeat
if (yy < ranks) then
if (position[xx, yy + 1] = 0) then begin
yy := yy + 1;
checkleg(xx, yy);
end;
until ((yy = ranks) or (position[xx, yy + 1] <> 0));
if ((yy < ranks) and (position[xx, yy + 1] < 0)) then checkleg(xx, yy + 1);
xx := x1; yy := y1;
repeat
if (yy > 1) then
if (position[xx, yy - 1] = 0) then begin
yy := yy - 1;
checkleg(xx, yy);
end;
until ((yy = 1) or (position[xx, yy - 1] <> 0));
if ((yy > 1) and (position[xx, yy - 1] < 0)) then checkleg(xx, yy - 1);
xx := x1; yy := y1;
repeat
if (xx < files) then
if (position[xx + 1, yy] = 0) then begin
xx := xx + 1;
checkleg(xx, yy);
end;
until ((xx = files) or (position[xx + 1, yy] <> 0));
if ((xx < files) and (position[xx + 1, yy] < 0)) then checkleg(xx + 1, yy);
xx := x1; yy := y1;
repeat
if (xx > 1) then
if (position[xx - 1, yy] = 0) then begin
xx := xx - 1;
checkleg(xx, yy);
end;
until ((xx = 1) or (position[xx - 1, yy] <> 0));
if ((xx > 1) and (position[xx - 1, yy] < 0)) then checkleg(xx - 1, yy);
end;
procedure blackrook;
var xx, yy: shortint;
begin
xx := x1; yy := y1;
repeat
if (yy < ranks) then
if (position[xx, yy + 1] = 0) then begin
yy := yy + 1;
checkleg(xx, yy);
end;
until ((yy = ranks) or (position[xx, yy + 1] <> 0));
if ((yy < ranks) and (position[xx, yy + 1] > 0)) then checkleg(xx, yy + 1);
xx := x1; yy := y1;
repeat
if (yy > 1) then
if (position[xx, yy - 1] = 0) then begin
yy := yy - 1;
checkleg(xx, yy);
end;
until ((yy = 1) or (position[xx, yy - 1] <> 0));
if ((yy > 1) and (position[xx, yy - 1] > 0)) then checkleg(xx, yy - 1);
xx := x1; yy := y1;
repeat
if (xx < files) then
if (position[xx + 1, yy] = 0) then begin
xx := xx + 1;
checkleg(xx, yy);
end;
until ((xx = files) or (position[xx + 1, yy] <> 0));
if ((xx < files) and (position[xx + 1, yy] > 0)) then checkleg(xx + 1, yy);
xx := x1; yy := y1;
repeat
if (xx > 1) then
if (position[xx - 1, yy] = 0) then begin
xx := xx - 1;
checkleg(xx, yy);
end;
until ((xx = 1) or (position[xx - 1, yy] <> 0));
if ((xx > 1) and (position[xx - 1, yy] > 0)) then checkleg(xx - 1, yy);
end;
procedure whitebishop;
var xx, yy: shortint;
begin
xx := x1; yy := y1;
repeat
if ((yy < ranks) and (xx < files)) then
if (position[xx + 1, yy + 1] = 0) then begin
yy := yy + 1; xx := xx + 1;
checkleg(xx, yy);
end;
until ((yy = ranks) or (xx = files) or (position[xx + 1, yy + 1] <> 0));
if ((yy < ranks) and (xx < files) and (position[xx + 1, yy + 1] < 0))
then checkleg(xx + 1, yy + 1);
xx := x1; yy := y1;
repeat
if ((yy > 1) and (xx < files)) then
if (position[xx + 1, yy - 1] = 0) then begin
yy := yy - 1; xx := xx + 1;
checkleg(xx, yy);
end;
until ((yy = 1) or (xx = files) or (position[xx + 1, yy - 1] <> 0));
if ((yy > 1) and (xx < files) and (position[xx + 1, yy - 1] < 0))
then checkleg(xx + 1, yy - 1);
xx := x1; yy := y1;
repeat
if ((yy < ranks) and (xx > 1)) then
if (position[xx - 1, yy + 1] = 0) then begin
yy := yy + 1; xx := xx - 1;
checkleg(xx, yy);
end;
until ((yy = ranks) or (xx = 1) or (position[xx - 1, yy + 1] <> 0));
if ((yy < ranks) and (xx > 1) and (position[xx - 1, yy + 1] < 0))
then checkleg(xx - 1, yy + 1);
xx := x1; yy := y1;
repeat
if ((yy > 1) and (xx > 1)) then
if (position[xx - 1, yy - 1] = 0) then begin
yy := yy - 1; xx := xx - 1;
checkleg(xx, yy);
end;
until ((yy = 1) or (xx = 1) or (position[xx - 1, yy - 1] <> 0));
if ((yy > 1) and (xx > 1) and (position[xx - 1, yy - 1] < 0))
then checkleg(xx - 1, yy - 1);
end;
procedure blackbishop;
var xx, yy: shortint;
begin
xx := x1; yy := y1;
repeat
if ((yy < ranks) and (xx < files)) then
if (position[xx + 1, yy + 1] = 0) then begin
yy := yy + 1; xx := xx + 1;
checkleg(xx, yy);
end;
until ((yy = ranks) or (xx = files) or (position[xx + 1, yy + 1] <> 0));
if ((yy < ranks) and (xx < files) and (position[xx + 1, yy + 1] > 0))
then checkleg(xx + 1, yy + 1);
xx := x1; yy := y1;
repeat
if ((yy > 1) and (xx < files)) then
if (position[xx + 1, yy - 1] = 0) then begin
yy := yy - 1; xx := xx + 1;
checkleg(xx, yy);
end;
until ((yy = 1) or (xx = files) or (position[xx + 1, yy - 1] <> 0));
if ((yy > 1) and (xx < files) and (position[xx + 1, yy - 1] > 0))
then checkleg(xx + 1, yy - 1);
xx := x1; yy := y1;
repeat
if ((yy < ranks) and (xx > 1)) then
if (position[xx - 1, yy + 1] = 0) then begin
yy := yy + 1; xx := xx - 1;
checkleg(xx, yy);
end;
until ((yy = ranks) or (xx = 1) or (position[xx - 1, yy + 1] <> 0));
if ((yy < ranks) and (xx > 1) and (position[xx - 1, yy + 1] > 0))
then checkleg(xx - 1, yy + 1);
xx := x1; yy := y1;
repeat
if ((yy > 1) and (xx > 1)) then
if (position[xx - 1, yy - 1] = 0) then begin
yy := yy - 1; xx := xx - 1;
checkleg(xx, yy);
end;
until ((yy = 1) or (xx = 1) or (position[xx - 1, yy - 1] <> 0));
if ((yy > 1) and (xx > 1) and (position[xx - 1, yy - 1] > 0))
then checkleg(xx - 1, yy - 1);
end;
begin
ep := false;
legals[depth] := 0; incheck := kingincheck;
if (incheck) then nopossiblechecks := false else begin
nopossiblechecks := true;
if (forwhite) then begin
for x1 := 1 to 8 do if ((position[x1, wky] = -2) or
(position[x1, wky] = -3)) then nopossiblechecks := false;
for x1 := 1 to 8 do if ((position[wkx, x1] = -2) or
(position[wkx, x1] = -3)) then nopossiblechecks := false;
x1 := wkx; y1 := wky;
while ((x1 < 8) and (y1 < 8)) do begin
x1 := x1 + 1; y1 := y1 + 1;
if ((position[x1, y1] = -2) or
(position[x1, y1] = -4)) then nopossiblechecks := false;
end;
x1 := wkx; y1 := wky;
while ((x1 > 1) and (y1 < 8)) do begin
x1 := x1 - 1; y1 := y1 + 1;
if ((position[x1, y1] = -2) or
(position[x1, y1] = -4)) then nopossiblechecks := false;
end;
x1 := wkx; y1 := wky;
while ((x1 < 8) and (y1 > 1)) do begin
x1 := x1 + 1; y1 := y1 - 1;
if ((position[x1, y1] = -2) or
(position[x1, y1] = -4)) then nopossiblechecks := false;
end;
x1 := wkx; y1 := wky;
while ((x1 > 1) and (y1 > 1)) do begin
x1 := x1 - 1; y1 := y1 - 1;
if ((position[x1, y1] = -2) or
(position[x1, y1] = -4)) then nopossiblechecks := false;
end;
end
else begin
for x1 := 1 to 8 do if ((position[x1, bky] = 2) or
(position[x1, bky] = 3)) then nopossiblechecks := false;
for x1 := 1 to 8 do if ((position[bkx, x1] = 2) or
(position[bkx, x1] = 3)) then nopossiblechecks := false;
x1 := bkx; y1 := bky;
while ((x1 < 8) and (y1 < 8)) do begin
x1 := x1 + 1; y1 := y1 + 1;
if ((position[x1, y1] = 2) or
(position[x1, y1] = 4)) then nopossiblechecks := false;
end;
x1 := bkx; y1 := bky;
while ((x1 > 1) and (y1 < 8)) do begin
x1 := x1 - 1; y1 := y1 + 1;
if ((position[x1, y1] = 2) or
(position[x1, y1] = 4)) then nopossiblechecks := false;
end;
x1 := bkx; y1 := bky;
while ((x1 < 8) and (y1 > 1)) do begin
x1 := x1 + 1; y1 := y1 - 1;
if ((position[x1, y1] = 2) or
(position[x1, y1] = 4)) then nopossiblechecks := false;
end;
x1 := bkx; y1 := bky;
while ((x1 > 1) and (y1 > 1)) do begin
x1 := x1 - 1; y1 := y1 - 1;
if ((position[x1, y1] = 2) or
(position[x1, y1] = 4)) then nopossiblechecks := false;
end;
end
end;
if (forwhite) then begin
for y1 := ranks downto 1 do
for x1 := 1 to files do
if (position[x1, y1] = 5) then whiteknight
else if (position[x1, y1] = 6) then whitepawn
else if (position[x1, y1] = 1) then whiteking
else if (position[x1, y1] = 4) then whitebishop
else if (position[x1, y1] = 2) then whitequeen
else if (position[x1, y1] = 3) then whiterook
end
else begin
for y1 := 1 to ranks do
for x1 := 1 to files do
if (position[x1, y1] = -5) then blackknight
else if (position[x1, y1] = -6) then blackpawn
else if (position[x1, y1] = -4) then blackbishop
else if (position[x1, y1] = -2) then blackqueen
else if (position[x1, y1] = -3) then blackrook
else if (position[x1, y1] = -1) then blackking
end;
if (legals[depth] = 0) then if (incheck) then legals[depth] := -1
else legals[depth] := -2;
positions := positions + 1;
if (positions > 99) then begin
positions := 0; kpos := kpos + 1;
if (kpos mod 25 = 0) then begin
settextstyle(defaultfont, horizdir, 1);
setcolor(cblack);
outtextxy(0, 250, kpstr);
str(kpos: 1, kpstr);
kpstr := kpstr + '00 nodes';
if (viewscores) then begin
setcolor(cblue);
outtextxy(0, 250, kpstr);
end;
settextstyle(defaultfont, horizdir, 2);
end;
if (kpos mod 5 = 0) then begin
gettime(ho2, mi2, se2, hu2);
if (se2 < se1) then se2 := se2 + 60;
sekunnit := sekunnit + 100 * se2 - 100 * se1 + hu2 - hu1;
gettime(ho1, mi1, se1, hu1);
if ((sekunnit >= smax) and (searchdepth > 1)) then keskeyta := true;
if (analysis) then keskeyta := false;
if (keypressed) then begin
chi := readkey;
if (analysis) then keskeyta := true else
if (chi = ' ') then keskeyta := true
end
end
end;
end;
{*************************************************************************}
function eval_leafs(forwhite: boolean; depth: integer): integer;
label 123;
var ii, store, k, iii, kkk, movevalue, bestvalue: integer;
moved, taken: shortint;
found, wq, bq, cutoff, protected: boolean;
begin
found := false;
if (forwhite) then bestvalue := -30000 else
bestvalue := 30000;
ii := 1;
repeat
if (legmvs[depth, ii].degree = 3) then found := true;
ii := ii + 1;
until ((found) or (ii > legals[depth]));
if (found) then bestvalue := posvalue;
if (depth = 2) then begin
if (forwhite) then beta[depth] := -30000 else
beta[depth] := 30000
end
else beta[depth] := beta[depth - 2];
cutoff := false;
for iii := 1 to 2 do
for kkk := 1 to legals[depth] do
if (legmvs[depth, kkk].degree = iii) then begin
store := posvalue;
taken := position[legmvs[depth, kkk].file2, legmvs[depth, kkk].rank2];
moved := position[legmvs[depth, kkk].file1, legmvs[depth, kkk].rank1];