This was a Gambit Fantasy Tournament game set from this position. White: BigDoggProblem; Black: moonbus; notes by moonbus. Initial ratings within 50 points.
16. Rf8f6 Bf1d3
White is now threatening much more than merely the e6-pawn: a crushing attack against the Black K is imminent, e.g. Nh5 or h2-h4-h5 etc.
17. Rf6f4
Black now launches upon a desperate gamble to defuse White's K-side attack by trading some material in exchange for a Q-side pawn majority.
17... Qg4h3 18. Bh6g5
Threatening to trap the White Q by … Rh4; hence, White is practically forced to exchange on e6 to escape with the Q, thereby releasing the tension against Black's K.
Attempting to save the B with … Bh6 fails to Qh8+ followed by Qxh7+ and xg6.
21... Qe5xg5 22. Rf4xf2
The point of the B sac: Black is going to win the White b2-pawn and thereby gain connected passers. But will it be sufficient compensation for the lost B? A huge and very uncertain gamble.
This was as far as I had been able to calculate when I played … Rf4; Black has 2 connected passers for the B and White's K-side attack has been blunted; tough, but playable.
25... Ng3e4 26. Ra8f8 h3
White anticipates the passer-advance and takes a precaution against a back-rank mate.
27. Kg8g7
Black takes a precaution against a B-skewer along the a2-g8 diagonal.
27... Ne4g3 28. Rf8f2 Ng3e2
Black's futile attempt to invade is easily repulsed; Black should concentrate on advancing his passers.
29. Rf2f6 Re3e5 30. Rf6d6
Black now gets on track to start advancing his Q-side pawn majority.
