English Opening Trainer
Details
| Author: | Mark |
| Rating: | |
| Difficulty: | Beginner |
| Date: | 2nd February 2021 |
| Description: | A trainer to help you learn and memorize all the variations of the English Opening. |
Code
//Please feel welcome to copy this code for your own creations.
//fromFen("rnbqkbnr/pppppppp/8/8/2P5/8/PP1PPPPP/RNBQKBNR w KQkq - 0 1");
let root = [
"c4",
{
"info": "This is the English Opening"
},
[
"c5",
{
"info": "This is the Symmetrical Defense"
},
[
"b4",
{
"info": "This is the Symmetrical Defense (Wing Gambit)"
}
],
[
"Nf3",
"Nf6",
[
"g3",
"b6",
"Bg2",
"Bb7",
"O-O",
"e6",
"Nc3",
"Be7",
{
"info": "This is the Symmetrical Hedgehog system"
},
"d4",
"cxd4",
"Qxd4",
"d6",
"Rd1",
"a6",
"b3",
"Nbd7",
{
"info": "This is the Symmetrical Flexible Hedgehog system"
}
],
[
"d4",
{
"info": "This is the Anti-Benoni"
},
"cxd4",
"Nxd4",
"e6",
{
"info": "This is the Anti-Benoni Variation"
},
"Nc3",
"Nc6",
{
"info": "This is the Anti-Benoni (Geller)"
}
]
],
[
"Nc3",
{
"info": "This is the Asymmetrical Variation"
},
[
"Nf6",
[
"g3",
"d5",
"cxd5",
"Nxd5",
{
"info": "This is the Asymmetrical (Rubinstein)"
}
],
[
"Nf3",
"d5",
"cxd5",
"Nxd5",
{
"info": "This is the Asymmetrical (Three Knights)"
},
"g3",
"Nc6",
"Bg2",
"e6",
"O-O",
"Be7",
{
"info": "This is the Asymmetrical (Keres)"
}
]
],
[
"Nc6",
{
"info": "This is the Symmetrical (Two Knights)"
},
[
"Nf3",
"Nf6",
{
"info": "This is the Symmetrical (Four Knights)"
}
],
[
"g3",
{
"info": "This is the Symmetrical (Fianchetto)"
},
"g6",
"Bg2",
"Bg7",
{
"info": "This is the Ultra-Symmetrical Variation"
},
[
"e4",
{
"info": "This is the Ultra-Symmetrical (Botvinnik)"
}
],
[
"e3",
"e5",
{
"info": "This is the Ultra-Symmetrical (Reversed Botvinnik)"
}
],
[
"Nf3",
{
"info": "This is the Ultra-Symmetrical"
},
[
"e5",
{
"info": "This is the Ultra-Symmetrical (Russian)"
}
],
[
"Nf6",
{
"info": "This is the Ultra-Symmetrical Variation"
},
"O-O",
"O-O",
[
"b3",
{
"info": "This is the Ultra-Symmetrical (Double Fianchetto)"
}
],
[
"d4",
{
"info": "This is the Ultra-Symmetrical (Mecking)"
}
]
]
]
]
]
]
],
[
"e5",
{
"info": "This is the Reversed Sicilian"
},
[
"g3",
"h5",
{
"info": "This is the Reversed Sicilian (Drill)"
}
],
[
"Nf3",
{
"info": "This is the Reversed Sicilian (Nimzovich)"
},
"e4",
{
"info": "This is the Reversed Sicilian (Flohr)"
}
],
[
"Qa4",
{
"info": "This is the Reversed Sicilian (English Queen)"
}
],
[
"Nc3",
{
"info": "This is the Reversed Sicilian"
},
[
"Bb4",
{
"info": "This is the Reversed Sicilian (Vienna)"
}
],
[
"d6",
[
"g3",
"c6",
{
"info": "This is the Reversed Sicilian (Keres)"
}
],
[
"Nf3",
"Bg4",
{
"info": "This is the Reversed Sicilian (Smyslov)"
}
]
],
[
"Nf6",
{
"info": "This is the Reversed Sicilian (Two Knights)"
},
[
"Nf3",
"e4",
"Ng5",
"b5",
{
"info": "This is the Reversed Sicilian (Bellón)"
}
],
[
"g3",
{
"info": "This is the Carls"
},
[
"d5",
{
"info": "This is the Carls (Reversed Dragon)"
}
],
[
"Bb4",
{
"info": "This is the Carls (Smyslov)"
}
],
[
"c6",
{
"info": "This is the Carls (Keres)"
}
],
[
"g6",
{
"info": "This is the Carls (Bremen)"
},
"Bg2",
"Bg7",
[
"d3",
{
"info": "This is the Carls (Closed)"
}
],
[
"e3",
"d6",
"Nge2",
"Be6",
{
"info": "This is the Carls (Hort)"
}
]
]
]
],
[
"Nc6",
{
"info": "This is the Closed Reversed Sicilian"
},
[
"g3",
{
"info": "This is the Closed Reversed Sicilian (Carls)"
},
"g6",
"Bg2",
[
"Bg7",
{
"info": "This is the Closed Reversed Sicilian (Taimanov)"
},
[
"e3",
"d6",
"Nge2",
"Be6",
{
"info": "This is the Closed Reversed Sicilian (Hort)"
}
],
[
"d3",
{
"info": "This is the Closed Reversed Sicilian"
},
"d6",
"e4",
{
"info": "This is the Closed Reversed Sicilian (Botvinnik)"
}
]
],
[
"Be6",
{
"info": "This is the Closed Reversed Sicilian (Tröger)"
}
]
],
[
"e3",
"Nf6",
"b3",
"d6",
{
"info": "This is the Closed Reversed Sicilian (Amsterdam)"
}
],
[
"Nf3",
{
"info": "This is the Three Knights System"
},
[
"f5",
{
"info": "This is the Three Knights System (Dutch)"
}
],
[
"Nf6",
{
"info": "This is the Four Knights System"
},
[
"a3",
{
"info": "This is the Four Knights System (Marini)"
}
],
[
"e4",
{
"info": "This is the Four Knights System (Nimzovich)"
}
],
[
"d4",
[
"e4",
{
"info": "This is the Four Knights System (Bradley Beach)"
}
],
[
"exd4",
"Nxd4",
"Bb4",
"Bg5",
"h6",
{
"info": "This is the Four Knights System (Nenarokov)"
}
]
],
[
"d3",
{
"info": "This is the Four Knights System (Capablanca)"
}
],
[
"e3",
"Bb4",
"Qc2",
[
"O-O",
"Nd5",
"Re8",
"Qf5",
{
"info": "This is the Four Knights System (Stean)"
}
],
[
"Bxc3",
{
"info": "This is the Four Knights System (Romanishin)"
}
]
],
[
"g3",
{
"info": "This is the Four Knights System (Fianchetto)"
}
]
]
]
]
]
],
[
"g6",
{
"info": "This is the Snake variation, aka the Great Snake variation"
},
"e4",
"e5",
{
"info": "This is the Snake (Adorjan) Defence"
}
],
[
"f5",
{
"info": "This is the Anglo-Dutch Defense"
},
[
"e4",
{
"info": "This is the Anglo-Dutch, Hickmann Gambit"
}
],
[
"b4",
{
"info": "This is the Anglo-Dutch, Polish Variation"
}
],
[
"g4",
{
"info": "This is the Anglo-Dutch, Wade Gambit, aka Grob attack"
}
],
[
"Nf3",
"d6",
"e4",
{
"info": "This is the Anglo-Dutch, Chabanon Gambit"
}
]
],
[
"b5",
{
"info": "This is the Jaenisch Gambit"
}
],
[
"d5",
{
"info": "This is the Anglo-Scandinavian Defense"
},
"cxd5",
"e6",
{
"info": "This is the Anglo-Scandinavian, Löhn Gambit"
}
],
[
"g5",
{
"info": "This is the Myers' Defense"
}
],
[
"c6",
{
"info": "This is the Anglo-Slav Defense"
},
[
"d4",
"d5",
{
"info": "This transposes to the Slav Defense"
}
],
[
"e4",
"d5",
{
"info": "This transposes to the Caro–Kann Defence"
}
],
[
"Nf3",
"d5",
[
"g3",
"Nf6",
"Bg2",
"g6",
{
"info": "This is the Anglo-Slav (Irregular)"
}
],
[
"b3",
{
"info": "This is the Caro–Kann Defence System 2, (aka Bogolubov)"
},
"Nf6",
[
"Bb2",
[
"Bf5",
{
"info": "This is the Bogolubov (New York)"
}
],
[
"Bg4",
{
"info": "This is the Bogolubov (Capablanca)"
}
]
],
[
"g3",
[
"Bf5",
{
"info": "This is the Bogolubov (London)"
},
"Bg2",
"e6",
"Bb2",
"Nbd7",
{
"info": "This is the Bogolubov (Réti)"
}
],
[
"Bg4",
{
"info": "This is the Bogolubov (Torre)"
}
]
]
]
]
],
[
"e6",
{
"info": "This is the Agincourt Defense"
},
"Nf3",
[
"Nf6",
"g3",
"a6",
{
"info": "This is the Romanishin Gambit"
}
],
[
"d5",
{
"info": "This is the Agincourt (King's Knight)"
},
[
"b3",
"Nf6",
"Bb2",
"c5",
"e3",
{
"info": "This is the Whimpey System"
}
],
[
"g3",
[
"c6",
{
"info": "This is the Kurajica Defense"
}
],
[
"Nf6",
{
"info": "This is the Neo-Catalan"
},
"Bg2",
[
"c5",
"b3",
"Nc6",
"O-O",
"Be7",
{
"info": "This is the Neo-Catalan (Tarrasch)"
}
],
[
"Bd6",
{
"info": "This is the Neo-Catalan (Bogo-Catalan)"
}
],
[
"dxc4",
{
"info": "This is the Neo-Catalan (Accepted)"
}
],
[
"Be7",
{
"info": "This is the Neo-Catalan"
},
[
"O-O",
{
"info": "This is the Neo-Catalan (Declined)"
}
],
[
"b3",
"O-O",
"Bb2",
"a5",
{
"info": "This is the Neo-Catalan (Bogolubov)"
}
]
]
]
]
]
],
[
"Nf6",
{
"info": "This is the Anglo-Indian"
},
[
"b4",
{
"info": "This is the Anglo-Indian (Polish)"
}
],
[
"Nf3",
{
"info": "This is the Anglo-Indian (King's Knight)"
},
"g6",
"g3",
"Bg7",
"Bg2",
"O-O",
{
"info": "This is the Anglo-Indian (King's Fianchetto)"
}
],
[
"Nc3",
{
"info": "This is the Anglo-Indian (Queen's Knight)"
},
[
"d5",
{
"info": "This is the Anglo-Grünfeld"
},
"cxd5",
"Nxd5",
[
"g3",
[
"g6",
"Bg2",
[
"Nb6",
{
"info": "This is the Anglo-Grünfeld (Czech)"
}
],
[
"Nxc3",
{
"info": "This is the Anglo-Grünfeld (Smyslov)"
}
]
],
[
"c5",
"Bg2",
"Nc7",
{
"info": "This is the Anglo-Grünfeld (Rubinstein)"
}
]
],
[
"Nf3",
"g6",
"g3",
"Bg7",
"Bg2",
"e5",
{
"info": "This is the Anglo-Grünfeld (Korchnoi)"
}
]
],
[
"e6",
{
"info": "This is the Hedgehog system"
},
[
"Nf3",
[
"b6",
{
"info": "This is the Hedgehog (Queen's Indian)"
},
"e4",
"Bb7",
"Bd3",
{
"info": "This is the Hedgehog (Romanishin)"
}
],
[
"Bb4",
{
"info": "This is the Hedgehog (Nimzovich)"
}
]
],
[
"e4",
{
"info": "This is the Mikenas"
},
[
"d5",
{
"info": "This is the Mikenas (French)"
},
"e5",
{
"info": "This is the Mikenas (Flohr)"
}
],
[
"Nc6",
{
"info": "This is the Mikenas (Kevitz)"
}
],
[
"c5",
{
"info": "This is the Mikenas (Sicilian)"
},
"e5",
"Ng8",
{
"info": "This is the Mikenas (Nei)"
}
]
]
]
]
]
];
let targetMove = "";
onPieceClicked(function (squareName) {
if (typeof targetMove == "string") {
if (squareName == sourceOfSan(targetMove)) {
return true;
}
} else if (Array.isArray(targetMove)) {
for (let temp of targetMove) {
if (squareName == sourceOfSan(temp)) {
return true;
}
}
} else {
throw new Error();
}
if (targetMove == "") {
return false;
}
if (squareName == sourceOfSan(targetMove)) {
return true;
}
highlightSquareRed(squareName);
return false;
});
onMoveAttempted(function (san) {
if (typeof targetMove == "string") {
if (san == targetMove) {
current.index++;
setTimeout(next, 50);
return true;
}
} else if (Array.isArray(targetMove)) {
for (let temp of targetMove) {
if (san == temp) {
for (let i = current.index; i < current.length; i++) {
if (current[i][0] == san) {
current[i].parent = current;
current = current[i];
current.index = 1;
break;
}
}
setTimeout(next, 50);
return true;
}
}
} else {
throw new Error();
}
return false;
});
onNextClicked(function () {
showNextButton(false);
next();
});
function nextDelayed() {
setTimeout(next, 500);
}
function onUndoClicked() {
undo();
if (current.index > 0) {
current.index--;
if (current.index > 0 && current[current.index].info != undefined) {
current.index--;
}
}
if (current.index == 0) {
if (current.parent != undefined) {
current = current.parent;
} else {
//showButton("undo", false);
}
}
next();
}
let current = root;
current.index = 0;
let preInfo = "";
createButton("Undo", onUndoClicked);
showButton("Undo", false);
let undoButtonVisible = false;
function next() {
let showUndoButton = current != root || current.index > 0;
if (undoButtonVisible != showUndoButton) {
showButton("Undo", showUndoButton);
undoButtonVisible = showUndoButton;
}
if (preInfo != "") {
preInfo += "<br><br>";
}
if (current.index >= current.length) {
info(preInfo + "End of the line");
preInfo = "";
return;
}
let step = current[current.index];
if (typeof step == "string") {
if (isWhitesTurn()) {
info(preInfo + "White to play <b>" + currentMoveNumber() + "." + step + "</b>");
} else {
info(preInfo + "Black to play <b>" + currentMoveNumber() + "..." + step + "</b>");
}
targetMove = step;
preInfo = "";
} else if (Array.isArray(step)) {
///assume that the rest of the steps in the current array are also arrays
//i.e. different options from this point
let possibleSteps = [];
for (let i = current.index; i < current.length; i++) {
//assume that the first step in every array is a string
//otherwise it would be seperated out into an array at the previous level
possibleSteps.push(current[i][0]);
}
targetMove = possibleSteps;
if (isWhitesTurn()) {
possibleSteps = possibleSteps.map(x => "<li><b>" + currentMoveNumber() + "." + x + "</b></li>");
info(preInfo + "White can play: <ul>" + possibleSteps.join("") + "</ul>");
} else {
possibleSteps = possibleSteps.map(x => "<li><b>" + currentMoveNumber() + "..." + x + "</b></li>");
info(preInfo + "Black can play: <ul>" + possibleSteps.join("") + "</ul>");
}
preInfo = "";
} else {
if (step.info != undefined) {
preInfo = step.info;
current.index++;
next();
}
}
}
next();