本文实例讲述了Javascript模拟深蓝vs卡斯帕罗夫的国际象棋对局示例。分享给大家供大家参考。具体如下：
var board = "
Garry Kasparov n
8║♜ ♞ ♝ ♛ ♚ ♝ ♞ ♜ Move: 0 n
7║♟ ♟ ♟ ♟ ♟ ♟ ♟ ♟ n
6║ n
5║ n
4║ n
3║ n
2║♙ ♙ ♙ ♙ ♙ ♙ ♙ ♙ n
1║♖ ♘ ♗ ♕ ♔ ♗ ♘ ♖ n
╚═══════════════ n
a b c d e f g h n
Deep Bluen
";
var gameintro = [
"Site: Philadelphia, PA USA n
Date: 1996.02.10 n
Round: 1 n
White: Deep Blue n
Black: Kasparov, Garry n
Result: 1-0 n
Opening: Sicilian Defense 2.c3 n
Annotator: Wheeler, David A.n
",
"This game is world-famous, because it was the first gamen
won by a computer against a reigning world champion under n
normal chess tournament conditions (in particular, normal time controls). n
",
"Deep Blue was a computer developed by IBM to win against Kasparov. n
Deep Blue won this game, but Kasparov rebounded over the following 5 n
games to win 3 and draw 2, soundly beating Deep Blue in the 1996 match. n
",
"In the 1997 rematch, Deep Blue managed to win the entire match. n
Garry Kasparov is considered to be one of the greatest human chess players n
of all time, so both this single game and the later win of a match showed n
that computer-based chess had truly arrived at the pinnacle of chess play. n
"
];
var movelist = "
1. e2e4 c7c5 n
2. c2c3 n
{It's more common to play 2. Nf3, but Kasparov has deep experience with n
that line, so white's opening book goes in a different direction.} n
n
2.... d7d5 n
3. e4xd5 Qd8xd5 n
4. d2d4 Ng8f6 n
5. Ng1f3 Bc8g4 n
6. Bf1e2 e7e6 n
7. h2h3 Bg4h5 n
8. e1g1h1f1 Nb8c6n
9. Bc1e3 c5xd4 n
10. c3xd4 Bf8b4 n
{A more common move here is Be7. This was a new approach by Kasparov, n
developing the bishop in an unusual way. Whether or not it's a good n
approach is debated. After this move, the computer left its opening book n
and began calculating its next move.} n
n
11. a2a3 Bb4a5 n
12. Nb1c3 Qd5d6 n
13. Nc3b5 Qd6e7?!n
{This allows white to make its pieces more active. n
Other moves, which would probably be better, include Qb8 and Qd5.} n
n
14. Nf3e5! Bh5xe2n
15. Qd1xe2 e8g8h8f8 n
16. Ra1c1 Ra8c8 n
17. Be3g5 n
{Black now has a problem, especially with the pinned knight on f6.} n
n
17.... Ba5b6 n
18. Bg5xf6 g7xf6 n
{Kasparov avoids ... Qxf6? because white would gain material with 19. Nd7.n
Note that Kasparov's king is now far more exposed.} n
n
19. Ne5c4! Rf8d8 n
20. Nc4xb6! a7xb6n
21. Rf1d1 f6f5 n
22. Qe2e3! n
{This is an excellent place for the white queen.} n
n
22... Qe7f6 n
23. d4d5! n
{Kasparov commented that he might have offered this pawn n
sacrifice himself in this position, since it hurt black's pawn n
structure, opened up the board, and black's exposed king suggested n
that there was probably a way to exploit the result. n
Kasparov has been attacking the d4 pawn, and the computer wisely n
decided to advance it for an attack instead of trying to defend it.} n
n
23... Rd8xd5 n
24. Rd1xd5 e6xd5 n
25. b2b3! Kg8h8? n
{Kasparov attempts to prepare a counter-attack, by preparing to n
move his rook to file g, but it won't work. n
Burgess suggests that 25.... Ne7 Rxc8+ would have better, though n
white would still have some advantage. n
Indeed, after this point on it's difficult to identify n
any move that will dramatically help black.} n
n
26. Qe3xb6 Rc8g8 n
27. Qb6c5 d5d4 n
28. Nb5d6 f5f4 n
29. Nd6xb7 n
{This is a very 'computerish'/materialistic move; white is grabbing n
an undeveloped pawn for a small gain in material. n
However, the computer has not identified any threat of checkmate or n
other risks from black, so it simply acquires the material.}n
n
29.... Nc6e5 n
30. Qc5d5 n
{The move 30. Qxd4?? would be terrible, because Nf3+ n
would win the white queen.} n
n
30.... f4f3 n
31. g2g3 Ne5d3 n
{The move 31... Qf4 won't work, because of 32. Rc8! Qg5 33. Rc5!} n
n
32. Rc1c7 Rg8e8 n
{Kasparov is attacking, but the computer has correctly determined that n
the attack is not a real threat.} n
n
33. Nb7d6 Re8e1+ n
34. Kg1h2 Nd3xf2 n
35. Nd6xf7+ Kh8g7n
36. Nf7g5 Kg7h6 n
37. Rc7xh7+ n
{Kasparov resigns - expecting ... Kg6 38. Qg8+ Kf5 Nxf3 and white's n
strength is overwhelming. White will have lots of ways to defeat black, n
while black has no real way to attack white.}n
";
var moveDisplayTime = 2000; // milliseconds
var messageDisplayTime = 6000; // milliseconds
// Indicator values, range from 8..30 - though Komodo uses a lot of these
// numbers for special purposes.
var indicWhiteSquare = 10;
var indicBlackSquare = 11;
var indicMoveFrom = 12;
var indicMoveTo = 13;
function HighlightSquares(scimoz) {
for (var line=1; line < 9; line++) {
for (var col=6; col < 21; col+=2) {
var pos = scimoz.findColumn(line, col);
var charlength = scimoz.positionAfter(pos) - pos;
var isBlackSquare = (line % 2) == 0 ? (col % 4) == 0 : (col % 4) == 2;
if (isBlackSquare) {
scimoz.indicatorCurrent = indicBlackSquare;
} else {
scimoz.indicatorCurrent = indicWhiteSquare;
}
scimoz.indicatorFillRange(pos, charlength);
}
}
}
function DrawInitialBoard(scimoz) {
// Set board styling.
scimoz.setMarginWidthN(0, 0); // Remove the line number margin.
scimoz.caretStyle = scimoz.CARETSTYLE_INVISIBLE; // Hide the caret
scimoz.indicSetStyle(indicWhiteSquare, scimoz.INDIC_STRAIGHTBOX); // See Scintilla docs for others
scimoz.indicSetAlpha(indicWhiteSquare, 40);
scimoz.indicSetOutlineAlpha(indicWhiteSquare, 30);
scimoz.indicSetFore(indicWhiteSquare, 0xFFFFFF); // Colour is BGR format!!
scimoz.indicSetStyle(indicBlackSquare, scimoz.INDIC_STRAIGHTBOX); // See Scintilla docs for others
scimoz.indicSetAlpha(indicBlackSquare, 40);
scimoz.indicSetOutlineAlpha(indicBlackSquare, 30);
scimoz.indicSetFore(indicBlackSquare, 0x000000); // Colour black - it's BGR format!!
scimoz.indicSetStyle(indicMoveFrom, scimoz.INDIC_ROUNDBOX); // See Scintilla docs for others
scimoz.indicSetAlpha(indicMoveFrom, 40);
scimoz.indicSetOutlineAlpha(indicMoveFrom, 90);
scimoz.indicSetFore(indicMoveFrom, 0x00EEEE); // Colour is BGR format!!
scimoz.indicSetStyle(indicMoveTo, scimoz.INDIC_ROUNDBOX); // See Scintilla docs for others
scimoz.indicSetAlpha(indicMoveTo, 40);
scimoz.indicSetOutlineAlpha(indicMoveTo, 90);
scimoz.indicSetFore(indicMoveTo, 0x00EEEE); // Colour is BGR format!!
// Add the board text.
scimoz.addText(ko.stringutils.bytelength(board), board);
// Make it a large board - valid range is +-20.
scimoz.zoom = 15;
// Highlight the black/white squares.
HighlightSquares(scimoz);
}
function DisplayMessage(scimoz, message, nosplit) {
try {
// Clear existing message lines.
for (var line=1; line < scimoz.lineCount; line++) {
var pos = scimoz.findColumn(line, 26);
var eolpos = scimoz.getLineEndPosition(line);
if (eolpos > pos) {
scimoz.targetStart = pos;
scimoz.targetEnd = eolpos;
scimoz.replaceTarget(0, "");
}
}
// Format the message.
var textUtils = Components.classes["@activestate.com/koTextUtils;1"]
.getService(Components.interfaces.koITextUtils);
var lines = message.split("n");
for (var i=0; i < lines.length; i++) {
lines[i] = ko.stringutils.strip(lines[i]);
}
if (!nosplit) {
message = lines.join(" ");
message = textUtils.break_up_lines(message, 26);
lines = message.split("n");
}
// Display new message - limit lines to
for (var i=0; i < lines.length; i++) {
var line = lines[i];
if (i+1 >= scimoz.lineCount) {
scimoz.currentPos = scimoz.length;
scimoz.newline();
}
var pos = scimoz.findColumn(i+1, 26);
var lineStart = scimoz.positionFromLine(i+1);
var lineDiff = pos - lineStart;
while (lineDiff < 26) {
// Add space padding to the start of the line.
line = " " + line;
lineDiff += 1;
}
scimoz.currentPos = pos;
scimoz.addText(ko.stringutils.bytelength(line), line);
}
} catch(ex) {
// Exception handling - show problems to the user.
alert("Error: " + ex + "nn" + ex.stack.toString());
}
}
function PlayIntro(scimoz, callback) {
for (var i=0; i < gameintro.length; i++) {
setTimeout(DisplayMessage, messageDisplayTime * i, scimoz, gameintro[i], i == 0);
}
setTimeout(callback, (messageDisplayTime * gameintro.length), scimoz);
}
function HighlightMove(scimoz, indicator, pos) {
scimoz.indicatorCurrent = indicator;
scimoz.indicatorClearRange(0, scimoz.length);
var charlength = scimoz.positionAfter(pos) - pos;
scimoz.indicatorFillRange(pos, charlength);
}
function GetBoardPosition(scimoz, chesscode) {
var col = chesscode.charCodeAt(0) - 'a'.charCodeAt(0);
var row = '8'.charCodeAt(0) - chesscode.charCodeAt(1);
return scimoz.findColumn(row+1, (col*2)+6);
}
function MakeMove(scimoz, move) {
var isTake = (move.indexOf("x") >= 0);
move = move.replace("x", "");
if (move.length == 8) {
// Special double move for castling.
MakeMove(scimoz, move.substr(4));
move = move.substr(0, 4);
}
if (move.length >= 5) {
move = move.substr(1);
}
var fromPos = GetBoardPosition(scimoz, move.substr(0, 2));
scimoz.targetStart = fromPos;
scimoz.targetEnd = scimoz.positionAfter(fromPos);
piece = scimoz.getTextRange(fromPos, scimoz.targetEnd);
scimoz.replaceTarget(" ".length, " ");
HighlightMove(scimoz, indicMoveFrom, fromPos);
var toPos = GetBoardPosition(scimoz, move.substr(2));
scimoz.targetStart = toPos;
scimoz.targetEnd = scimoz.positionAfter(toPos);
scimoz.replaceTarget(piece.length, piece);
HighlightSquares(scimoz);
HighlightMove(scimoz, indicMoveTo, toPos);
// Clear old messages.
DisplayMessage(scimoz, "", false);
}
function ProcessMove(scimoz, move) {
move = move.replace("!", "");
move = move.replace("?", "");
move = move.replace("+", "");
var match = move.match(/(d+).s*([w.]+)s*(w+)?/);
if (!match.length) {
dump("Unrecognized move: " + move + "n");
}
var moveWhite = match[2];
var moveBlack = match[3];
if (moveWhite[0] != ".") {
MakeMove(scimoz, moveWhite);
} else {
MakeMove(scimoz, moveBlack);
return;
}
setTimeout(MakeMove, moveDisplayTime, scimoz, moveBlack);
}
function PlayMoves(scimoz) {
var moves = movelist.split("n");
var state = "move";
var message = "";
var nexttimeout = 0;
for (var i=0; i < moves.length; i++) {
var move = ko.stringutils.strip(moves[i]);
if (!move) {
continue;
}
switch (state) {
case "move":
if (move.match(/^[0-9]+./)) {
// Piece to move.
setTimeout(ProcessMove, nexttimeout, scimoz, move);
nexttimeout += moveDisplayTime;
nexttimeout += moveDisplayTime;
break;
} else if (move[0] == "{") {
state = "message";
message = "";
move = move.substr(1);
// Fallthrough.
} else {
continue;
}
case "message":
if (move.indexOf("}") >= 0) {
move = move.substring(0, move.indexOf("}"));
state = "move";
}
if (message) message += " ";
message += move;
if (state == "move") {
setTimeout(DisplayMessage, nexttimeout, scimoz, message, false);
message = "";
nexttimeout += messageDisplayTime;
}
break;
}
}
}
function PlayChess(view) {
try {
var scimoz = view.scimoz;
DrawInitialBoard(scimoz);
PlayIntro(scimoz, PlayMoves);
} catch(ex) {
// Exception handling - show problems to the user.
alert("Error: " + ex + "nn" + ex.stack.toString());
}
}
// Create a new text file asynchronously and start playing chess.
ko.views.manager.donewViewAsync("Text", "editor", PlayChess);
希望本文所述对大家的javascript程序设计有所帮助。
