Anyway, I just guessed 23...Nxg3 24.hxg3 e4.

23............e4
Opening up the diagonal b8h2 for Queen access towards King's camp

24.Nxe4 Nxe4
25.Bxe4 Nxg3!
26.hxg3 Qxg3+
27.Qg2 Qxg2+
28.Kxg2 Bxe4
Black is now two pawns up and game may continue:

Black is ahead a pawn, which is isolated, doubled, passed, hanging, and in the center. The obvious idea is . 22 ... e4
23 Ng5/Ne1 e3
24 Bxe3 Nxg3
24 hxg3 Qxg3+

But White has two alternatives at Move 24 that defend g3, both of which are likely better than this line. So if this idea basically works, 23 ... Nxg3 is likely the move.

In a further difficulty, the 23 Ne1 options sets up White to interpose rather effectively at g2.

I had 23...e4 24.Nxe4 <24...Bxe4> followed by 25.Bxe4 Nxg3 26.hxg3 Qxg3+ 27.Qg2 Nxe4 28.Qxg3 Nxg3 and its hard to see how White avoids losing the exchange

Even so, Fritz indicates that Black appears to hold his own after a complicated struggle with 25...e5! when play might continue 26. Nxe5 Rxe5 27. Nd5 Nxd5 28. cxd5 Qg7 29. Ba2 Bd6 30. Qe3 Rf5 31. Bh6 Rxf1+ 32. Rxf1 Qc7 33. Qxe4 Bc8 34. Qe3 Bf5 35. Rc1 Qd7 36. Rc6 Qf7 37. Qxb6 Qf6 38. Bc4 g5 39. Qf2 Kf7 40. g4 Qxh6 41. Bf1 Qf6 42. gxf5 h5 43. Rxa6 h4 44. a4 Qe5 45. Rc6 Kf8 = (.009 @ 22 depth, Deep Fritz 14).

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The pawn on e5 is momentarily safe (24.Nxe5 Rxd2 25.Qxd2 Qxe5; 24.Qxe5 Qxe5 25.Nxe5 Rxd2).

My first idea is 23... e4, to open the b8-h2 diagonal for the black queen:

A) 24.Nxe4 Nxe4 25.Bxe4 Nxg3 26.hxg3 Qxg3+ 27.Kh1 (27.Qg2 Qxg2+ 28.Kxg2 Bxe4 - + [B+2P vs N]) 27... Qh3+

A.1) 28.Qh2 Qxh2+ followed by 29... Bxe4 - + [B+2P vs N].

A.2) 28.Nh2 Bxe4 29.Qxe4 Rxd2 wins.

A.3) 28.Kg1 Qg4+ recovers the piece - + [B+2P vs N].

B) 24.Bf4 exf3 wins a piece (25.Bxc7 fxe2 26.Rfe1 Rd7).

C) 24.Ng5 Nxg3 25.hxg3 Qxg3+ 26.Qg2 (else 26... Qxg5 - + [3P]) 26... Qxg2+ 27.Kxg2 Rxd2+ - + [3P].

D) 24.Nh4 Nxg3 25.hxg3 Qxg3+ 26.Ng2 (26.Qg2 Qxg2+ and 27... Rxd2 as above) 26... Ng4 wins (27.Rfd1 Qh2+ 28.Kf1 Qh1#).

<23...e4!!> This solves the Sunday puzzle with a deflection that enables Black to safely sacrifice a Knight for two pawns and then win a piece back with a won position.

The immediate 23...Nxg3? only leads to equality, as explained in my post above.

<24. Nxe4> This is the logical human reply, but there are at least two other reasonable alternatives.

If 24. Ne1, then Black wins after 24...e3 25. Bxe3 (25. Qxe3 Qd6 26. Bd3 Ng4 27. Qe2 Qd4+ ) 25... Nxg3 26. hxg3 Qxg3+ 27. Ng2 Bxg2 28. Qe1 Qh3! 29. Rxf6 Be7 30. Be4 Bxe4 31. Nxe4 Qg4+ 32. Qg3 Qxg3+ 33. Nxg3 Bxf6 (-3.01 @ 20 depth).

If 24. Nh4, then Black wins with 24...Nxg3 25. hxg3 Rxd2 26. Qxd2 Qxg3+ 27. Qg2 Qxh4 (-3.12 @ 20 depth).

<24... Nxe4 25. Bxe4 Nxg3> Now the sham sacrifice works, as Black wins back the piece, two pawns up, after <26. hxg3 Qxg3+ 27. Qg2> (27. Kh1 Qh3+ 28. Kg1 Qg4+ 29. Kf2 Bxe4 (-4.80 @ 20 depth) <27... Qxg2+ 28. Kxg2 Bxe4>

White's weak, two-pawn deficit, position is worse than it looks, as shown by the continuation <29. Be3 Rd3 30. Bxb6 Rxa3>

This wins, but even stronger for black is 30... g5! 31. Kg3 Bd6+ 32. Kg4 (32. Kg2 g4 ) 32... Bxf3+ 33. Rxf3 h5+ (-7.74 @ 20 depth).

<31. c5 Bh6 32. Rce1 Bd5 33. Rd1 Ba8 34. Rd6 Bf4 0-1> (-7.77 @ 20 depth)