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Symmetric Sissa problem. Problem based on an actual game.[All Comments] [Add Comment or Rating]Congratulations on presumed solution after 10 years. I added regionally-related Maura's Modern Chess to my other Comment, back 10, today. That is, the sequence Alexandre, Bird, Lasker, Capablanca, Maura, Fischer, (lesser lights Seirawan et al.), more or less (one could think of 6 or 12 more lesser lights according to opinion), should include Modern. Not that Modern's same-coloured Bishops are appealing to many, but the way Gabriel Maura presented it as solution or evolution ranks it with the main sequence of others. The list shows over 200 years the progressive urgency for change.
Solution: 1. ... Sg3+ (c5-e3-g3 / g3-h2-h1) The White King is in check, and only has 2 moves Ki1 and Kh1 [the g1 square is under attack by the g-Sissa (g3-e1-g1)] 2.Ki1 Sfxi2# (f8-i5-i2 / i2-h2-i1) The i-Sissa checks on i1, and attacks h2 (i2-i1-h2); the g-Sissa protects the i-Sissa (g3-h2-i2) and attacks h1 (g3-h2-h1); mate! or if: 2. Kh2 Sfxi2# (f8-i5-i2 / i2-h1-h2) The King is in check by the i-Sissa, and he can't take either of the Sissas with the King as he would be in check by the other Sissa 'after!' the capture (note that the Sissas do not have a path to protect each other until the King moves out of h2, which it can't as he would be in check). The Sissas attack all the possible squares for the white King: g3 -> i-Sissa (i2-h2[once the King moves]-g3) -> This path protects the other Sissa i2 -> g-Sissa (g3-h2[once the King moves]-i2) -> This path protects the other Sissa i3 -> g-Sissa (g3-i5-i3) g1 -> g-Sissa (g3-e1-g1) h1 -> g-Sissa (g3-h2[once the King moves]-h1) i1 -> i-Sissa (i2-h1-i1)
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