With g2 so vulnerable, I would consider Rxe5 first and foremost:
1. …..Re5 2. g3
If Qxe5, black mate with Qg2. If white plays h3, black just takes at e4 first. At least with g3, white momentarily gets a rook and knight for his queen:
2. …..Re4 3. Re4 Qg5 4. Rf4 Qd5 5. Nf3 g5 and I don’t see how white saves the knight.
1… Rxe5!! wins the white rook outright, doesn’t it? The white queen has to keep g2 protected to avoid Qxg2 checkmate, so the only possible moves for him are either 2. Qc2 or 2. Qf3. Then 2… Rxe1 and what has white got in compensation?
Here’s a line where black more easily defeats white, though white plays fairly solid moves: 1… Rxe5 {White resigns here in the actual game.} 2. g3 Rxe4 3. Rxe4 Qd1 4. Rxf4 Qd5+ 5. Nf3 g5 6. Rf8+ Kg7 7. Re8 Qxf3+ 8. Kg1 h4 {Attacking the pawn here ultimately gives the white king less shelter and threatens imminent mate attack.} 9. Rd8 h3 10. Rd7+ Kg6 11. Rd2 Qe3+ 12. Rf2 Qc1+ 13. Rf1 Qxb2 14. Rf2 Qa1+ 15. Rf1 Qxa2 16. Rf2 Qa1+ 17. Rf1 Qd4+ 18. Rf2 Kh5 19. g4+ Qxg4+ 20. Kh1 Qd1+ 21. Rf1 Qxf1#
The above is a mix of my own ideas and Fritz 13’s, almost entirely Fritz’s in this particular case after 8… h4. My own choice of 9… hxg3 also resulted in a quick win, but not nearly as elegant as this one. A full analysis (180 sec per move) by Fritz found no better moves for either white or black than the above line, other than a trivial time waster at 16. Rf6+.
Re5
With g2 so vulnerable, I would consider Rxe5 first and foremost:
1. …..Re5
2. g3
If Qxe5, black mate with Qg2. If white plays h3, black just takes at e4 first. At least with g3, white momentarily gets a rook and knight for his queen:
2. …..Re4
3. Re4 Qg5
4. Rf4 Qd5
5. Nf3 g5 and I don’t see how white saves the knight.
RXp Black wins
RXP diverting quesn from guarding vital g2 square black wins if queen f3 then QxQ PxQ RXR material up and easy win
RxP diverting white queen guading
g2 If Q moves to F3 then QxQ then
PxQ then RxR material up for black and easy win
[FEN “4r2k/pp4p1/2p5/4P2p/4Qnq1/8/PP4PP/4R1NK b – – 0 0”]
1… Rxe5
2. g3 Rxe4
3. Rxe4 Qd1
4. Rxf4 Qd5+
5. Nf3 g5
6. Rf8+ Kg7
7. Ra8? Qxf3+
8. Kg1 h4
9. gxh4 gxh4
10. Rd8 Qe2
11. Rd7+ Kg6
12. Rd6+ Kg5
13. Rd8 Kg4
14. Re8 Qxe8
15. Kf2 Kf4
16. b3 Qe3+
17. Kg2 h3+
18. Kf1 Kf3
19. a3 Qf2#
An analysis with Fritz 13 agreed with the above line up to move 7, but preferred 7. Re8 to Ra8 (not surprising), which leads to more difficulties for white. The following is a mix of my ideas and Fritz’s:
7. Re8 Qxf3+
8. Kg1 Qd1+
9. Kf2 Kg6
10. Re2 Kf5
11. Ke3 Qg1+
12. Rf2+ Kg4
13. a3 Qc1+
14. Kd3 Qd1+
15. Ke3 Qb3+
16. Kd2 Qxb2+
17. Ke3 Qxa3+
18. Kd4 c5+
19. Kc4 Qe3
20. h3+ Kxg3
21. Rb2 Qc1+
22. Kb5 Qxb2+
23. Kxc5 Qe5+
24. Kc4 Kf3
25. Kd3 Qd5+
26. Kc2 Ke3
27. Kb2 Kd3
28. h4 Qb5+
29. Ka3 Kc3
30. hxg5 Qb3#
1 … R:e5
E5
1. … Re8xe5
–br
This is possible to see even in a blitz game:
1. Rxe5! Qf3/Qc2 (Qxe5?? Qxg2#)
wins a rook and the game.
1… Rxe5!! wins the white rook outright, doesn’t it? The white queen has to keep g2 protected to avoid Qxg2 checkmate, so the only possible moves for him are either 2. Qc2 or 2. Qf3. Then 2… Rxe1 and what has white got in compensation?
1. .. Rxe5 !? My blitz went three times around the block until it struck
Here’s a line where black more easily defeats white, though white plays fairly solid moves:
1… Rxe5 {White resigns here in the actual game.}
2. g3 Rxe4
3. Rxe4 Qd1
4. Rxf4 Qd5+
5. Nf3 g5
6. Rf8+ Kg7
7. Re8 Qxf3+
8. Kg1 h4 {Attacking the pawn here ultimately gives the white king less shelter and threatens imminent mate attack.}
9. Rd8 h3
10. Rd7+ Kg6
11. Rd2 Qe3+
12. Rf2 Qc1+
13. Rf1 Qxb2
14. Rf2 Qa1+
15. Rf1 Qxa2
16. Rf2 Qa1+
17. Rf1 Qd4+
18. Rf2 Kh5
19. g4+ Qxg4+
20. Kh1 Qd1+
21. Rf1 Qxf1#
The above is a mix of my own ideas and Fritz 13’s, almost entirely Fritz’s in this particular case after 8… h4. My own choice of 9… hxg3 also resulted in a quick win, but not nearly as elegant as this one. A full analysis (180 sec per move) by Fritz found no better moves for either white or black than the above line, other than a trivial time waster at 16. Rf6+.