whats_new/rules/3checks.html

   1 <html>
   2 <header>
   3 <title>Three Checks</title>
   4 <link rel=StyleSheet href="./moves.css" type="text/css">
   5 <script type="text/javascript" src="spartan.js"></script>
   6 </header>
   7 <body>
   8 <h1>Three Checks</h1>
   9 <table cellpadding="20"><tr><td>
  10 <img src="FIDE.png">
  11 </td><td>
  12 <h3>Initial setup</h3>
  13 <p>
  14 e1, e8: King
  15 <br>
  16 d1, d8: Queen
  17 <br>
  18 a1, a8, h1, h8: Rook
  19 <br>
  20 c1, c8, f1, f8: Bishop
  21 <br>
  22 b1, b8, g1, g8: Knight
  23 <br>
  24 a2-h2, a7-h7: Pawns
  25 </p>
  26 </td></tr></table>
  27
  28 <h3>Moves at a Glance</h3>
  29
  30 <p>Click on a piece below to see its moves</p>
  31
  32 <table class="board"><tr><td class="h" id="0x9">
  33
  34      </td><td class="n" id="1x9" onmouseDown="down_click(1,-9)" onmouseUp="up_click()">
  35 <img src="sym/BlackRook.png">
  36      </td><td class="n" id="2x9">
  37
  38      </td><td class="n" id="3x9">
  39
  40      </td><td class="n" id="4x9">
  41
  42      </td><td class="n" id="5x9" onmouseDown="down_click(5,9)" onmouseUp="up_click()">
  43 <img src="sym/BlackKing.png">
  44      </td><td class="n" id="6x9">
  45
  46      </td><td class="n" id="7x9">
  47
  48      </td><td class="n" id="8x9" onmouseDown="down_click(8,9)" onmouseUp="up_click()">
  49 <img src="sym/BlackRook.png">
  50      </td><td class="h" id="9x9">
  51
  52      </td><td class="h">
  53 <img src="sym/yellow.png">
  54      </td><td class="w" rowspan="2" valign="top">
  55 <p>Sliding capture or non-capture,<br>can be blocked on any square along the ray</p>
  56 </td></tr><tr><td class="h" id="0x8">
  57
  58      </td><td class="n" id="1x8">
  59
  60      </td><td class="n" id="2x8">
  61
  62      </td><td class="n" id="3x8">
  63
  64      </td><td class="n" id="4x8">
  65
  66      </td><td class="n" id="5x8">
  67
  68      </td><td class="n" id="6x8">
  69
  70      </td><td class="n" id="7x8">
  71
  72      </td><td class="n" id="8x8">
  73
  74      </td><td class="h" id="9x8">
  75
  76 </td></tr><tr><td class="h" id="0x7">
  77
  78      </td><td class="n" id="1x7">
  79
  80      </td><td class="n" id="2x7">
  81
  82      </td><td class="n" id="3x7">
  83
  84      </td><td class="n" id="4x7">
  85
  86      </td><td class="n" id="5x7">
  87
  88      </td><td class="n" id="6x7">
  89
  90      </td><td class="n" id="7x7">
  91
  92      </td><td class="n" id="8x7">
  93
  94      </td><td class="h" id="9x7">
  95
  96      </td><td class="h">
  97 <img src="sym/orange.png">
  98      </td><td class="w">
  99 Unblockable leap (capture or non-capture)
 100 </td></tr><tr><td class="h" id="0x6">
 101
 102      </td><td class="n" id="1x6">
 103
 104      </td><td class="n" id="2x6">
 105
 106      </td><td class="n" id="3x6">
 107
 108      </td><td class="n" id="4x6">
 109
 110      </td><td class="n" id="5x6">
 111
 112      </td><td class="n" id="6x6">
 113
 114      </td><td class="n" id="7x6">
 115
 116      </td><td class="n" id="8x6">
 117
 118      </td><td class="h" id="9x6">
 119
 120      </td><td class="h">
 121 <img src="sym/green.png">
 122      </td><td class="w">
 123 Non-capture only
 124 </td></tr><tr><td class="h" id="0x5">
 125
 126      </td><td class="n" id="1x5">
 127
 128      </td><td class="n" id="2x5">
 129
 130      </td><td class="n" id="3x5">
 131
 132      </td><td class="n" id="4x5">
 133
 134      </td><td class="n" id="5x5">
 135
 136      </td><td class="n" id="6x5">
 137
 138      </td><td class="n" id="7x5">
 139
 140      </td><td class="n" id="8x5">
 141
 142      </td><td class="h" id="9x5">
 143
 144      </td><td class="h">
 145 <img src="sym/red.png">
 146      </td><td class="w">
 147 Capture only
 148 </td></tr><tr><td class="h" id="0x4">
 149
 150      </td><td class="n" id="1x4">
 151
 152      </td><td class="n" id="2x4">
 153
 154      </td><td class="n" id="3x4">
 155
 156      </td><td class="n" id="4x4">
 157
 158      </td><td class="n" id="5x4">
 159
 160      </td><td class="n" id="6x4">
 161
 162      </td><td class="n" id="7x4">
 163
 164      </td><td class="n" id="8x4">
 165
 166      </td><td class="h" id="9x4">
 167
 168 </td></tr><tr><td class="h" id="0x3">
 169
 170      </td><td class="n" id="1x3" onmouseDown="down_click(1,3)" onmouseUp="up_click()">
 171 <img src="sym/BlackPawn.png">
 172      </td><td class="n" id="2x3" onmouseDown="down_click(2,3)" onmouseUp="up_click()">
 173 <img src="sym/WhitePawn.png">
 174      </td><td class="n" id="3x3" onmouseDown="down_click(3,3)" onmouseUp="up_click()">
 175 <img src="sym/WhiteRook.png">
 176      </td><td class="n" id="4x3" onmouseDown="down_click(4,3)" onmouseUp="up_click()">
 177 <img src="sym/WhiteKnight.png">
 178      </td><td class="n" id="5x3" onmouseDown="down_click(5,3)" onmouseUp="up_click()">
 179 <img src="sym/WhiteQueen.png">
 180      </td><td class="n" id="6x3" onmouseDown="down_click(6,3)" onmouseUp="up_click()">
 181 <img src="sym/WhiteBishop.png">
 182      </td><td class="n" id="7x3" onmouseDown="down_click(7,3)" onmouseUp="up_click()">
 183 <img src="sym/WhiteKing.png">
 184      </td><td class="n" id="8x3">
 185
 186      </td><td class="h" id="9x3">
 187
 188 </td></tr><tr><td class="h" id="0x2">
 189
 190      </td><td class="n" id="1x2">
 191
 192      </td><td class="n" id="2x2">
 193
 194      </td><td class="n" id="3x2">
 195
 196      </td><td class="n" id="4x2">
 197
 198      </td><td class="n" id="5x2">
 199
 200      </td><td class="n" id="6x2">
 201
 202      </td><td class="n" id="7x2">
 203
 204      </td><td class="n" id="8x2">
 205
 206      </td><td class="h" id="9x2">
 207
 208 </td></tr><tr><td class="h" id="0x1">
 209
 210      </td><td class="n" id="1x1">
 211
 212      </td><td class="n" id="2x1" onmouseDown="down_click(-2,1)" onmouseUp="up_click()">
 213 <img src="sym/WhitePawn.png">
 214      </td><td class="n" id="3x1">
 215
 216      </td><td class="n" id="4x1">
 217
 218      </td><td class="n" id="5x1">
 219
 220      </td><td class="n" id="6x1">
 221
 222      </td><td class="n" id="7x1">
 223
 224      </td><td class="n" id="8x1">
 225
 226      </td><td class="h" id="9x1">
 227
 228 </td></tr><tr><td class="h" id="0x0">
 229
 230      </td><td class="n" id="1x0">
 231
 232      </td><td class="n" id="2x0">
 233
 234      </td><td class="n" id="3x0">
 235
 236      </td><td class="n" id="4x0">
 237
 238      </td><td class="n" id="5x0">
 239
 240      </td><td class="n" id="6x0">
 241
 242      </td><td class="n" id="7x0">
 243
 244      </td><td class="n" id="8x0">
 245
 246      </td><td class="h" id="9x0">
 247
 248 </td></tr></table>
 249
 250 <p id="piece" height="20">:<br>:<br>:<br>:</p>
 251
 252 <table cellpadding="5" border="1"><tr><td>
 253 Piece
 254      </td><td>
 255 ID
 256      </td><td>
 257 value
 258      </td><td>
 259 Moves (<a href="Betza.html">Betza notation</a>)
 260      </td><td>
 261 Remarks
 262 </td></tr><tr><td>
 263 King
 264      </td><td>
 265 K
 266      </td><td>
 267 -
 268      </td><td>
 269 K
 270      </td><td>
 271 Can castle with Rook, moving 2 steps towards it
 272 </td></tr><tr><td>
 273 Queen
 274      </td><td>
 275 Q
 276      </td><td>
 277 9.5
 278      </td><td>
 279 RB or Q
 280      </td><td>
 281
 282 </td></tr><tr><td>
 283 Rook
 284      </td><td>
 285 R
 286      </td><td>
 287 5
 288      </td><td>
 289 R
 290      </td><td>
 291
 292 </td></tr><tr><td>
 293 Bishop
 294      </td><td>
 295 B
 296      </td><td>
 297 3.25
 298      </td><td>
 299 B
 300      </td><td>
 301 Color-bound
 302 </td></tr><tr><td>
 303 Knight
 304      </td><td>
 305 N
 306      </td><td>
 307 3.25
 308      </td><td>
 309 N
 310      </td><td>
 311
 312 </td></tr><tr><td>
 313 Pawn
 314      </td><td>
 315 P
 316      </td><td>
 317 1
 318      </td><td>
 319 mfWcfF
 320      </td><td>
 321 Promotes to Q, R, B, or N on reaching last rank
 322 </td></tr></table>
 323 <h3>Pawn peculiarities</h3>
 324 <ul>
 325 <li>Pawns capture differently from how they move (straight move, diagonal capture).</li>
 326 <li>Pawns can move two squares straight ahead from their initial position, provided they are not blocked.</li>
 327 <li>On the move immediately after such a double push, they can be captured en passant by another Pawn,
 328 as if they had only moved 1 square ahead.</li>
 329 <li>Pawns promote to another (non-royal) piece of choice when they reach last rank.</li>
 330 </ul>
 331 <h3>Castling</h3>
 332 <p>
 333 A King that has not moved before can move two squares in the direction of a Rook that has not moved before,
 334 in which case that Rook is moved to the square the King skipped over.
 335 This is only allowed if all squares between King and Rook are empty,
 336 when the King is not in check on the square it came from,
 337 and would not be in check on any of the squares it skipped over.
 338 </p>
 339 <h3>General rules</h3>
 340 <ul>
 341 <li>It is not allowed to expose your King to capture.</li>
 342 <li>The game is won by checkmating the opponent's King, <b>or by checking it for the third time</b>.</li>
 343 <li>Stalemate (no legal moves, but not in check) is a draw.</li>
 344 </ul>
 345 <h3>Differences with FIDE</h3>
 346 <p>
 347 You lose when being checked for the third time.
 348 </p>
 349 <h3>Strategy issues</h3>
 350 <p>
 351 Bishops are confined to squares of a single color.
 352 Having Bishops on both colors compensates this weakness, and is worth an extra 0.5 on top of their added value.
 353 </p>
 354 <p>
 355 </p>
 356 <p>
 357 </p>
 358 <p>
 359 </p>
 360 <p>
 361 </p>
 362 <p>
 363 </p>
 364 </body>
 365 </html>