Had I just, for fun, tried 23. Qf8+ - I would have solved this puzzle.

I found the game continuation though and it is a solid move that keeps all sorts of threats alive. Therefore, 0.25 out of 1 for today seems fair.

My streak ends today having solved 14 straight. And I end the week with 6.25 out of 7.

If you think deductive reasoning is head-spinning, what about inductive reasoning (http://en.wikipedia.org/wiki/Induct...)? The statement "All crows are black" is logically equivalent to "All non-black entities are non-crows." Hence you can prove or disprove the proposition in either of two ways: You can examine the set of crows one by one and verify that each one is indeed black, or you can examine the set of non-black objects one by one and verify that each one is not a crow.

Of course it is impossible in practice to check every single member of either set. All you can do is collect evidence that *tends* to confirm the proposition, provided you don't encounter any exceptions. The more cases you check, the stronger the confirmation. This is how scientists accumulate support for theories, which, however, are never completely proven beyond any shadow of doubt.

I can't see any any other candidate move aside from:

22Ne5 Bxe5

or

22Rde1 & at some point Qxb7 Qd8. Qxc6 Rxc6

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click for larger view

This move requires little calculation; it keeps black's knight pinned, eliminating the threat of 22...Ne2 and any back rank mate threats. It also sets up the forcing sequence of text moves that leave white up two pawns after 28 Qxb7.

click for larger view

Perhaps you are missing that Black Q is pinned to its K by the White Q.

22.Nb6 seems to win an exchange, but I think

22...Rxb6
23.Qxb6 Rc2

is causing trouble.

I don't really see a good candidate move which could be the solution. Time to check.

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It seems my move was right, but since I missed almost everything, I don't give myself a point. Maybe a bit more confidence next time, since it seems I am able to spot the right move.

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I tried a move with the Knight after long thinking:

22.Nb6
Two lines may happen:
A)22............Nc2
23.Rxd7 Nxb4
24.Nxc8 Rxc8
25.Rxb4
White is a whole Rook+pawn up

B)22............Qd6
23.Qxd6 Rxd6
24.Nxc8 Rd8
25.R1d8 g6
<if ....Rxc8 26.Re8+ Rxe8 27.Rxe8#>