Chess of the position. Weaknesses in the pawn structure, such as isolated, doubled, or backward pawns and , once created, are often permanent. Care must therefore be taken to avoid these weaknesses unless they are compensated by another valuable asset (for example, by the possibility of developing an attack). A chess opening is the group of initial moves of a game (the "opening moves"). Recognized sequences of opening moves are referred to as "openings" and have been given names such as the Ruy Lopez or Sicilian Defense. They are catalogued in reference works such as the "Encyclopaedia of Chess Openings". There
Ruy Lopez, Noah's Ark Trap and José Capablanca at the Budapest tournament in 1929: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. d4 5... b5 6. Bb3 Nxd4 7. Nxd4 exd4 8. Qxd4?? 8... c5 9. Qd5 Be6 10. Qc6+ Bd7 11. Qd5 c4 (see diagram) A variation of this trap can occur in the Sicilian Defense after the moves 1.e4 c5 2.Nf3 Nc6 3.Bb5 (the Rossolimo Variation) a6 4.Ba4?? (4.Bxc6 is necessary and the point of 3.Bb5 itself) b5 5.Bb3 c4 (see diagram) and the bishop is similarly trapped. Bibliography Ruy Lopez, Noah's Ark Trap The Noah's Ark Trap