");
anawin.document.writeln(" Click on the piece you wish to move and then click on its destination square. ");
anawin.document.write("
");}
function initdia(){
if (dummy1 == 1) return;
window.status = "Init. diagrams...";
j=0;
for(i=0;i
");}
function st(id,t){
document.getElementById(id).firstChild.nodeValue=t;}
function st2(id,t){
var e=document.getElementById(id);
e.style.fontSize="8pt";
e.style.fontFamily="MS Sans Serif";
e.style.fontWeight="bold";
return st(id,t);}
function paintframe(ibrd){
if(!document.getElementById)return;
var i=0;
var l=ibrd*100;
if(!rotated[ibrd]){
i=9;
st2(l+140,"a");st2(l+141,"b");st2(l+142,"c");st2(l+143,"d");st2(l+144,"e");st2(l+145,"f");st2(l+146,"g");st2(l+147,"h");
st2(l+130,"a");st2(l+131,"b");st2(l+132,"c");st2(l+133,"d");st2(l+134,"e");st2(l+135,"f");st2(l+136,"g");st2(l+137,"h");
i=0;}
else{
st2(l+140,"h");st2(l+141,"g");st2(l+142,"f");st2(l+143,"e");st2(l+144,"d");st2(l+145,"c");st2(l+146,"b");st2(l+147,"a");
st2(l+130,"h");st2(l+131,"g");st2(l+132,"f");st2(l+133,"e");st2(l+134,"d");st2(l+135,"c");st2(l+136,"b");st2(l+137,"a");
i=9;}
for (j=0; j<8; j++){
st2(l+100+j,Math.abs(i-(8-j)));
st2(l+110+j,Math.abs(i-(8-j)));}}
var fa = "";
var fe = "";
var dc = "#D5D5D5";
function koord(idxbrd, iid) {
var k = "abcdefgh";
document.write("
");
for (i = 0; i < 8; i++) {
wfc(dc, (idxbrd * 100) + iid + i, fa + k.charAt(i) + fe); }
document.write("
"); }
var x="x";
var goback=-1;
var goahead=-2;
var idx=0;
var bidx=0;
var lastidx=new Array(0, 145, 0);
var lastcolor="#000000";
var movebgcol="#FF0000";
var movecol="#00FFFF";
var bgcolor="#ECECEC";
var maxvar=10;
var engl=2;
var lang=new Array("¢","£","¦","¥","¤","");
var nbgames = 2;
var diagram=self;
var timer=null;
var dummy2=0;
var dummy3=0;
zg=new Array(
"rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR 1 x","5135","1127","5034","0118","6245","0238","3427pAA","3845NAA","w5 17 12 ","2718nAA","r2qkbnr/ppp1pppp/2n5/3P4/3P4/5b2/PP2PPPP/RNBQKB1R 5 9","5445bAA","0327PAA","5244","1228","r2qkbnr/ppp1pppp/2P5/8/3P4/5b2/PP2PPPP/RNBQKB1R 5 10","4518PAA","5742","1220","5236",
"0533","5345","1329","w9 39 27 32 ","3628","r2qk1nr/ppp3pp/2b1p3/5p2/1b1PP3/2N2P2/PP4PP/R1BQKB1R 9 24","6134","2936PAA","3420pAA","0621","r2qk1nr/ppp3pp/2b1p3/5p2/1b1PP3/2N2P2/PP4PP/R1BQKB1R 9 24","3629pAA","2029PAA","6134","0339","5446","3912","r2qk1nr/ppp3pp/2b1p3/4Pp2/1b1P4/2N2P2/PP4PP/R1BQKB1R 9 25","0612","4840","3324",
"6134","1827","5932","1018","w13 56 49 ","3443","r2qk2r/pp2n1pp/2p1p3/b2bPp2/Q1BP4/P1N2P2/1P4PP/R1B1K2R 13 46","3427bAA","1227BAA","5851","0925","3250","0339","r2qk2r/pp2n1pp/2p1p3/b2bPp2/Q2P4/P1NB1P2/1P4PP/R1B1K2R 13 47","0317","w14 63 60 ","4350","r3k2r/pp2n1pp/1qp1p3/b2bPp2/Q2P4/P1NB1P2/1P4PP/R1B1K2R 14 57","4933","1735PAA","r3k2r/pp2n1pp/1qp1p3/b2bPp2/Q2P4/P1N2P2/1PB3PP/R1B1K2R 14 58",
"1716","w15 77 67 ","5059","r3k2r/pp2n1pp/q1p1p3/b2bPp2/Q2P4/P1N2P2/1PB3PP/R1B1K2R 15 64","4933","1634","5849","2417","5659","0003","4227bAA","1227NAA","5951","r3k2r/pp2n1pp/q1p1p3/b2bPp2/Q2P4/P1N2P2/1P4PP/R1BBK2R 15 65","2734","w16 88 81 ","4537","r3k2r/pp2n1pp/q1p1p3/b3Pp2/Q1bP4/P1N2P2/1P4PP/R1BBK2R 16 78","4933","2417","3216qAA",
"3416QAA","5844","2937","r3k2r/pp2n1pp/q1p1p3/b3Pp2/Q1bP1P2/P1N5/1P4PP/R1BBK2R 16 79","04020003","w17 98 92 ","5844","2kr3r/pp2n1pp/q1p1p3/b3Pp2/Q1bP1P2/P1N5/1P4PP/R1BBK2R 17 89","4933","2417","3216qAA","3416QAA","5941","2kr3r/pp2n1pp/q1p1p3/b3Pp2/Q1bP1P2/P1N1B3/1P4PP/R2BK2R 17 90","1227","4451","2717","3250","0335PAA","w20 108 106 ","5658",
"2k4r/pp4pp/qnp1p3/b3Pp2/2br1P2/P1N5/1PQB2PP/R2BK2R 20 103","5945","2k4r/pp4pp/qnp1p3/b3Pp2/2br1P2/P1N5/1PQB2PP/2RBK2R 20 104","3443","5041","1734","6053","3451BAA","4120pAA","0201","5945","1617","5346","5145BAA","5445nAA","4334","2029pAA","2442NAA","4942bAA","3551","2947",
"1422","4639","1523","4738","1753","3846","2230","3938","2331","3829","3443","2920","5317","4630pAA","1826","2013","4334","1314","0706"
,
"rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR 1 x","5236","1026","6245","1220","5135","2635PAA","4535pAA","0621","5742","1119","6152","0512","60626361","04060705","5844","0118","5337","0310","5960","1835NAA",
"4435nAA","2028","3544","0220","3729","2034","5234bAA","1034BAA","4430","0504","3021nAA","1221BAA","4227","b18 195 182 ","2103","r3r1k1/pp3ppp/3p1b2/3NpP2/2q1P3/8/PPP3PP/R3QRK1 17 179","3450PAA","w18 192 186 ","6153","r3r1k1/pp3ppp/3p1b2/3NpP2/4P3/8/PPq3PP/R3QRK1 18 183","5658",
"5049PAA","6046","0605","4647","r3r1k1/pp3ppp/3p1b2/3NpP2/4P3/8/PPq2RPP/R3Q1K1 18 184","5026","5658","r2br1k1/pp3ppp/3p4/3NpP2/2q1P3/8/PPP3PP/R3QRK1 18 180","5042","0925","4941","3426","6263","0002","6145","b22 218 205 ","0607","2rbr1k1/p4ppp/3p4/1pqNpP2/4P3/1PP2R2/P5PP/R3Q2K 21 202","1321","w22 211 209 ","4547",
"2rbr1k1/p5pp/3p1p2/1pqNpP2/4P3/1PP2R2/P5PP/R3Q2K 22 206","4832","2rbr1k1/p5pp/3p1p2/1pqNpP2/4P3/1PP4R/P5PP/R3Q2K 22 207","0824","6039","1523","3938","0607","5661","2rbr2k/p4ppp/3p4/1pqNpP2/4P3/1PP2R2/P5PP/R3Q2K 22 203","2921","1421PAA","6039","0406","2721pAA","0614","4546","0321NAA","3921bAA","0206","5659",
"1927","w28 0 233 ","4614rAA","6rk/p4prp/5Q2/1pqpp3/4P3/1PP3R1/P5PP/3R3K 28 230","4614rAA","0614RAA","5927pAA","2605","2703"
);
br=new Array(
new Array(
x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x
),
new Array(
x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x
)
);
//-->
Elementos de Estrategia: Casillas Débiles
Probablemente el tema más simple para iniciarse en el complejo mar de la Estrategia en ajedrez es el de las "Casillas Débiles".
Casillas débiles son aquellas que el contrario puede ocupar con sus piezas sin que sea posible desalojarle de su posición. En principio esto puede ocurrir con cualquier casilla que no pueda ser atacada por los peones, que son los únicos que pueden forzar a las demás piezas a retirarse.
Este tipo de casillas tienen mayor importancia cuando están situadas en puntos neurálgicos de nuestra posición, tales como las inmediaciones del enroque
o en puntos centrales. Por el contrario, si están situadas lejos de donde se desarrollan las operaciones principales, su importancia puede llegar a ser nula.
Pillsbury, Harry Nelson - Chigorin, Mikhail Ivanovich
St Petersburg Match tournament (St Petersburg RUS), 1896
Round 4 [D07]
9...♞e710.a3♝a511.♝c4♝d5! El caballo
negro ubicado en d5 parece ser una maniobra obvia, pero Chigorin hace una sutil elección. El negro trata
de cambiar el alfil de casillas claras, tras lo cual esas casillas se volverán mas débiles. 12.♛a4+c613.♝d3
17...♞d5!El caballo
negro es un verdadero monstruo por su poder en el centro. Finalmente, la casilla débil es ocupada del
mejor modo posible. 18.♝d2♞b619.♛c2♜xd420.♜c1?Este error cuesta un peón.