diagonal
- Bishops often take the scenic route, weaving from side to side to reach their target. Their paths are the diagonals
- There are four key diagonals in the opening game of chess, at least in the classical open games:
- Italian diagonal — the one in the Italian Game leading to f7, a2-g8 (Schiffers-Harmonist)
- Greek diagonal — the one leading to h7, b1-h7, named for the ‘Greek gift’ sacrifice on that square, as illustrated by many examples from El Greco
- long diagonal — the longest diagonal, a1-h8 (and a8-h1) (Rohde-Bonin)
- Fool’s diagonal — the short one e1-h4 (or e8-h5) from which the King can be checked (or checkmated)
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