[Retros] Double-pin mate

afretro afretro at yandex.ru
Fri Nov 10 13:13:16 EST 2006

Here▓s a double-pin mate:
1.Pe2-e4 Pf7-f5 2.Qd1-g4 Pf5-f4 3.Qg4xd7 Ke8-f7
4.Qd7xc7 Qd8-d5 5.Pd2-d4 Qd5xa2 6.Sb1-d2 Qa2-b1
7.Ra1-a5 Sb8-d7 8.Ra5-f5 Sd7-f6 9.Pd4-d5 Ph7-h5
10.Bf1-c4 Rh8-h6 11.Sg1-e2 Rh6-g6 12. O-O Qb1xc1
13.Qc7-d7 Qc1-a1 14.Pd5-d6
How many pins can be effective in the mate position of an SPG (regardless of the mating piece)? Three? Four? Or even more?

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