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SOLUZIONE:1. Ah3 ...A ) 1. ... Ra8 2. Dxa6 Rb8 3. Dc8#B ) 1. ... Rb8 2. Dxa6 Rc7 (Ra8) 3. Dc8#C ) 1. ... Rc7 2. Dg4 Rd8 (Rb8 3. Dc8#) 3. Dd7#D ) 1. ... a5 2. Da6+ Rxa6 (Rc7 3. Dc8#) 3. Ac8#