Good that it is an attempt at limiting the Bishop, but bad strategically after: 1...c6 White has 2. Qxf6 (White can take the Knight right away, but why not weaken Black's pawn structure first and force the game into a very favorable ending for White 2...gxf6 3. Rxe7 cxb5 leaving White up a pawn, with a rook on the seventh rank, and with black having several potential pawn weaknesses (doubled f-pawns, isolated h-pawn, and doubled b-pawns). However, from experience even though white has a lot of factors in his favor rook endings are notoriously drawish, so White should try and limit Black's rooks activity by forcing them to passively guard the pawns weaknesses and not allow them to do any attacking!

Missed this move, but I am suspicious of it's efficacy.

Skewering the Knight and the doubled f-pawn and if 1...Kg7, then 2. Bxf7! winning another pawn.

? relegating the knight to a passive position and losing another pawn. Why not Nd6 and if Rxf6, then KxB and white has Tripled b-pawns!

? Trying to trap the Bishop, but missing that Bxf7 is now possible! White will now be up three pawns.

Black maybe thought that after Bxf7 he had Kg7, but if Kg7 White has several ways to protect both the Bishop and the rook.

Also good was probably 23.Rf4 forcing a trade of minor pieces.

? Loses another pawn! And also trades down further! Black's drawing chances are diminishing as the pieces disappear.

Black never seems to try and exploit White's weak back rank.

? Black hastens the end and allows white to freely correct his big pawn weakness.