Two Move Chess
In international chess it is widely recognized that the player who moves first (White) has a slight advantage. On her move, the player with the white pieces surveys a board where each player has made the same number of moves. By contrast, on his move the player with the black pieces faces a board where he is always one move behind his opponent.
Revised Double Move Chess (also known as Chess2) is a chess variant that is designed to remedy White's first move advantage in a manner similar to Balanced Marseillais Chess and Doublemove Chess, but in a manner that adheres more closely to the play of international chess.
Setup
The board, pieces, and starting position for Chess2 are the same as in international chess.
Pieces
The pieces in Chess2 are exactly the same as in international chess.
Rules
The starting position in Revised Double Move Chess (Chess2) is the same as in international chess. White begins the game with a single move. From then on, each player makes either one or two moves per turn. Each of these moves must be individually legal according to the rules of international chess for the current position on the board. When making two moves in a turn, a player cannot move a piece twice. For example, if a player castles on the first move of a two move turn, she cannot move either the king or castling rook on the second move of that turn. A player makes only a single move and ends his turn if any of these conditions apply to that move:
- The move places the opponent in check (or checkmate)
- The move provides an opportunity for an en passant capture
- The move captures an opponent's piece
- The move promotes a pawn
After a player has made a single move, his opponent then also takes a turn with a single move (unless the game has ended in checkmate). This move, known as a "response" move, does not itself cause the next turn to be a response move even if it meets one of the criteria above.
In most situations where a player contemplates a single move turn, he has the strategic choice of either making a single move or taking a two move turn in which only the second move satisfies one of the criteria for a single move.
Check and checkmate are evaluated exactly as in international chess for each position on the board (i.e. two separate positions are evaluated on a two move turn). Stalemate has a slight twist when compared to international chess. If at the start of his turn a player has no available legal two move turns and no available legal single move turns, the game ends in stalemate. For example, if a player is reduced to having only the King on the board and is unable to capture an opposing piece on his turn, the game ends in stalemate.
Because each move of a two move turn must be legal according to the rules of international chess, a player who is in check must escape from check on the next move--if she has a two move turn this must occur on the first of those moves. Likewise, if a player has an opportunity to capture an opponent's pawn en passant, the pawn can only be captured on the next move. It cannot occur on the second move of a two move turn.
While learning to play Chess2, players may want to verbally announce "single move" and "response" while taking single move and response turns, in a manner similar to the verbal announcement of "check" that beginners often agree to make in international chess.
Each position created by a two move turn is included in the count toward a draw by threefold repetition, or toward a draw by the Fifty move rule (or the Seventy-five move rule).
A double move in Chess2 is recorded with a comma separating the standard notation for each of the two moves. For example, "Nf6,d5" is a common first move for Black.
In Revised Double Move Chess (Chess2), each player usually begins her turn facing a board where she has made one less move than her opponent and ends it having made one more move than her opponent. When making a single move, she instead chooses to catch up to her opponent in the number of moves taken. After the response move, she again faces a board where she has made one less move than her opponent. This situation is maintained for each player throughout the game, providing a balance between the players in terms of the number of moves taken that does not exist in international chess.
Notes
Example 1
In this example, White makes a single move that places Black in check, and Black blocks the check with a single response move.
| 1.e4 | c5,d6 |
| 2.Bb4+ | Nd7 |
Example 2
This example is nearly the same as Example 1, except that White places Black in check on the second move of a two move turn.
| 1.e4 | c5,d6 |
| 2.Nf3,Bb5+ | Nd7,Nf6 |
Example 3
In this example Black makes a single move that provides an en passant capture opportunity. In this case, White does not capture en passant in her response move.
| 1.d4 | Nf6,c5 |
| 2.c4,d5 | e5 |
| 3.Nc3 |
Example 4
Here is an entire game of Chess2. This game is based on the game played between Magnus Carlsen and Fabiano Caruana in the third round of the World Chess Championship match on 2018-11-12. The move order has been changed in a number of places from the original game in order to construct a legal game of Chess2. Although players of this caliber would certainly make many different strategic choices if they had actually been playing Chess2, this game illustrates that Chess2 is very similar to international chess even while providing a more balanced game.
| 1.e4 | c5,Nc6 |
| TODO | TODO |
TODO
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By Ted Larson Freeman.
Last revised by Ted Larson Freeman.
Web page created: 2021-08-09. Web page last updated: 2021-08-26