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Opposition along a diagonal is called diagonal opposition. Sometimes diagonal opposition is used to achieve direct opposition. An example is the position in the first diagram, with Black to move. White has the direct opposition in this position, but it does him no good because his king cannot attack the black pawn after the black king moves away.
Marseillais chess (or Two-move chess): After the first turn of the game by White being a single move, each player moves twice per turn. Monster chess (or Super King ): White has the king and four pawns (c2-f2) against the entire black army but may make two successive moves per turn.
In games, it usually means to line up rooks and/or the queen on a file, or to place a bishop and a queen on a diagonal. [20] In chess problems, battery refers to an arrangement of two pieces in line with the enemy king on a rank, file, or diagonal so that if the middle piece moves a discovered check (or a threat other than a check) will be ...
The bishop's predecessor in medieval chess, shatranj (originally chaturanga), was the alfil, meaning "elephant", which could leap two squares along any diagonal, and could jump over an intervening piece. As a consequence, each fil was restricted to eight squares, and no fil could attack another.
The point is that it is awkward for White to meet the threat of ...Nb4, hitting d5 and a2, when Nc3 may often be met by ...Nfxd5 because of the latent pin down the long diagonal. Another idea is 5...e6 !? ; after 6.Nc3 exd5 7.Nxd5 Be7 8.Nxe7 Qxe7 9.e3 0-0 10.Nf3 the move 10...Rxa6 is a strong exchange sacrifice giving Black enough compensation.)
The idea is to eventually counterattack on the g1–a7 diagonal with a move like ...Qb6, preventing White from castling. [23] An example line would be 6...g6 7.Nf3 Bg7 8.a4 Nc6 (note 8...Nc6 as opposed to the usual Najdorf ...Nbd7, as c6 is a more flexible square for the knight with a queen on b6) 9.Bd3 Qb6.
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Black breaks the pin on the h4–d8 diagonal and forms a pin of their own on the c3-knight (exploiting the absence of the White's queen bishop from the queenside). If Black later plays dxc4, there may be threats against the g5-bishop. Note that 5.cxd5 cannot win a pawn because of the Elephant Trap. The main line continues 7.Nd2 Bb4 with the ...