Check your opponent three times and you win — checkmate optional.
Standard chess with an extra win condition: give check three times and you win immediately, regardless of the position. Checkmate still ends the game as normal.
Three-Check rewards a completely different kind of aggression. A check that achieves nothing positionally is worth a third of a game, so moves that a normal chess player would dismiss as pointless become the strongest on the board.
Knights and queens check from squares bishops cannot reach. A knight that can reach a checking square is worth more than a rook that cannot.
…h6 or …g6 style moves that look slow are essential here. Every diagonal or file pointing at your king is a third of a loss.
A piece for two checks is often a winning trade. Count the score, not the material.
Sometimes holding a check in reserve is stronger — your opponent must play the whole game avoiding a position where it becomes available.
The g- and h-files and the a2–g8 diagonal all point at a castled king. In this variant that is three checks waiting to happen.
And it lets the moving piece go anywhere. This is the single most dangerous pattern in the variant.
Track it. Players lose Three-Check by playing a normal good move on move 30 when they were already at two checks.
Most tactical oversights below 1600 are missed checks, either yours or theirs. Three-Check makes checks the currency of the game, and after a few dozen games you simply see them all, in every game you play.
That is the argument for variants generally, and it is worth stating plainly: a variant removes part of chess so that what remains gets your full attention. Played casually they are a pleasant break. Played deliberately — naming the skill first, then going back to a standard game and finding the same idea — they are the most efficient training available, because you are practising one thing at a time instead of everything at once.
Attacking players, and anyone who wants to get better at spotting checks — a skill that transfers directly back to standard chess.
You can play it right now on any device, in a browser, against a full engine — no download and no account. If you have never tried a variant before, give it three games rather than one: the first is spent learning the rules, and the second is where it starts being chess.
In the browser, against a real engine, no sign-up. One of twenty variants in the Grandmaster Gains Academy.
♔ Play Three-Check ChessStandard chess with an extra win condition: give check three times and you win immediately, regardless of the position. Checkmate still ends the game as normal.
The rules take about two minutes. Attacking players, and anyone who wants to get better at spotting checks — a skill that transfers directly back to standard chess.
Value checking pieces enormously. Knights and queens check from squares bishops cannot reach. A knight that can reach a checking square is worth more than a rook that cannot.
Grandmaster Gains has Three-Check Chess playable in the browser against a full engine, free and with no sign-up, alongside nineteen other variants.
Seeing every check on the board. Most tactical oversights below 1600 are missed checks, either yours or theirs. Three-Check makes checks the currency of the game, and after a few dozen games you simply see them all, in every game you play.
Do not castle into a checking net. The g- and h-files and the a2–g8 diagonal all point at a castled king. In this variant that is three checks waiting to happen.
Each variant isolates one skill and drills it harder than any exercise. The coach's guide to variants covers which one to use for what, or see the trainer classroom.