411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bb5/3...f5/4. d3
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tright Ruy Lopez, Schliemann Defence rd bd qd kd bd nd rd pd pd pd pd pd pd nd bl pd pd pl pl nl pl pl pl pl pl pl rl nl bl ql kl rl Common moves: 4...fxe4 - only move
The move 4.d3 defended e4 but also threatened to snaffle the f5-pawn into the bargain, because now Black won't have the instant rejoinder ...e4.
4...fxe4 is the only move to justify the Black pawn thrust.Ruy Lopez