411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...c5/2. d4/2...cxd4/3. c3/3...dxc3/4. bxc3
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Smith-Morra gambit accepted B21 Sicilian defence → Smith-Morra gambit accepted
4. bxc3??
White forgets why they offered the pawn sacrifice 3. c3 in the first place. Slavish adherence to the rule of "capture towards the centre" has lead them here, down a pawn, with isolated a- and c-pawns, nothing developed, and with their knight unable to reach c3.
Black should have an easy game.