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
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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
5...Bg4
This aggressive move pins the f3-knight and is a good way to stop the threat of Nxe5. But this also has a hidden sting to it! The 'Obvious' h3 allows a hidden trap!
Theory table
+6h3
h5 +/=
Ruy Lopez, Exchange Variation