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| Umberto Castellari, Sinfonie Scacchistiche, 1969. Código FEN: 6b1/1p1K1p2/4N1R1/3pk1pR/3p2pb/3Bp1p1/8/7Q w - - 0 1. |
As Brancas jogam e dão xeque-mate em 2 lances!
(White to play and give checkmate in 2 moves!)
Umberto Castellari (18/11/1912 - 02/11/1976) foi um problemista italiano, especialista em mates em dois e mates ajudados. Ele editou a revista "Il Due Mosse" de 1952 a 1962 e a seção de mates ajudados da "Sinfonie Scacchistiche" de 1966 a 1974.
(Umberto Castellari (18/11/1912 - 02/11/1976) was an Italian composer, expert in two-movers and helpmates. He edited the magazine "Il Due Mosse" from 1952 to 1962 and the helpmate section of the "Sinfonie Scacchistiche" from 1966 to 1974.)
PCFilho
1 Qf1! threatens three mates: 2 Qf4[A]/Qf5[B]/Qf6[C]. No black move parries all of these threats, but three defenses separate them:
ResponderExcluir1 ... fxg6 2 Qf4[A]
1 ... f5 2 Qxf5[B]
1 ... fxe6 2 Qf6[C]
This constitutes the Fleck theme. And, if you really want to push it, the fourth possible move by the f-pawn, 1 ... f6, allows all three threats, so we also have the Pickaninny theme.
Removing the b7-pawn leaves this solution unchanged. Removing the g8-bishop leaves the problem sound, albeit with a dual after 1 ... fxe6. Finally, removing the f7-pawn still makes a sound problem, but with only one non-thematic defense, it wouldn't be a very good problem. However, removing both the f7-pawn and g8-bishop allows cooks. The remaining black pieces are necessary for soundness.
Well done, Jake. And again thanks for the explanation.
Excluir