Discovered attacks
	Are usually double attacks
	Most typical - discovered check
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	Q what if white's Queen was on d6; or e5 or even a3
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5
notes
1
				…Bg1+ sets up a discovered attack - in this particular case black could not find
				a place to put the bishop to attack
				If the Queen were on a dark square such as e5 black would play
				1…Bg1+ 2 Kh2 (forced move) Bd4 - check with the Rook and the Queen has been won
2
				note that this is not just a fork; but a double attack and discovered attack
				the fork is not terribly dangerous without white's Rook on e1, since black could move
				Queen to d6;  d7 or e8 in that case
3
	a better defence for black (though forced mate in 6) would have been
1.Kd1 …Qxe2+, 18. Kc1 …Qf1+, 19. Kc2…Re2+, 20. Kb3 …Qd1+ 21. Kc4 …Re4+, 22.Kb5 …Qa4 mate
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