411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bb5/3...a6/4. Bxc6/4...dxc6/5. O-O/5...Bg4/6. h3
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Ruy Lopez: Exchange Variation rd qd kd bd nd rd pd pd pd pd pd pd pd pd pl bd nl pl pl pl pl pl pl pl rl nl bl ql rl kl
6. h3
This move looks natural, forcing Black's hand, but there is a surprising option for Black! /6...h5/ is a surprising move that forces White's hand instead.
Theory table
+67...
h5d3
Qf6=...
Bxf3Qxf3 +/=
Ruy Lopez, Exchange Variation