First you have go through these two RHP games.
.
danrose84 - Benjamin Barker RHP 2018
[FEN "2kr3r/2p4p/1p1q1p2/4n3/p2p4/RbP3P1/5PBP/Q3NRK1 w - - 0 26"]
26. Bh3+ Kb8 {First White chased the King to b8.} 27. cxd4 Nc4 28. Rxb3 {Now White opens the a-file.} 28... axb3 29. Bg2 {White crosses his fingers and waits...} 29... b2 {The wait is over. Black could have played Qa3 here.} 30. Qa8# {That is an a1-a8 checkmate.}
Next clue coming up. I hope you are paying attention, I’ll be asking questions.
Nunzio Bonaventura - iuko piuko RHP 2018
[FEN "8/r4ppk/3p3p/1Qp5/1pP5/P7/3q2PP/4R1K1 w - - 0 29"]
29. Re8 bxa3 {Better was Rxa3 when White is getting mated.} 30. Qb1+ g6 31. Qa1 {Black here has Qd4+ getting the Queens off with an easily won ending.} 31... a2 {That is an OOPS!} 32. Qh8 {An a1-h8 checkmate.}
OK you have had the clues now solve this mate in two from Guidelli.
White to play and mate in two moves.
Not three or four moves. Two Moves.
(the solution will be given below)
Don’t panic. I am not going to give any of the games.
These two blundered in similar circumstances, thought I’d show those instead.
D. Navara - B. Gelfand Olympiad 2018
[FEN "3R4/1p3pk1/1r4p1/p5P1/P4P2/1r6/KP6/7R w - - 0 31"]
31. Rh2 {Gelfand too intent on his attack on b2 now slipped on this banana.} 31... f5 {OOPS!} 32. Rd7+ Kg8 33. Rc2 {The move Black missed. Black has to give up a Rook to stop checkmate. 1-0.}
V. Anand - G. Meier, GRENKE 2019
[FEN "8/1r3pk1/3q3p/3P1Rp1/2p3P1/2P1Q3/Pr4P1/2KR4 w - - 0 33"]
33. Qe5+ {Vishy gets the Black Queen off the board before she joins in on the attack.} 33... Qxe5 34. Rxe5 Rxg2 35. Rd4 Rg1+ 36. Kc2 {An OOPS!, though White is struggling Rd1 had to played.} 36... Rgb1 {White resigned. As in the previous game A Rook must be given up to stop mate.} 37. Kd2 {The King must run out of the mating net.} 37... R7b2+ 38. Ke3 Re1+ 39. Kf3 Rxe5
I bumped into this on the Edward Winter site.
How could they get THAT date wrong.
Difficult, but there is a pitfall that is just waiting for someone to fall into.
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bf4 Be7 {So far so good, now 5.e3 is usual and good but this tempting move...} 5. Nb5 {Has been played 10 times on RHP and nobody has tried this next move.} 5... c6 {Looks like a blunder but...} 6. Nc7+ Qxc7 7. Bxc7 {White will already have notched this up as 1-0.} 7... Bb4+ {But White has to give the Queen back. One reason why 5.e3 is played.} 8. Qd2 Bxd2+ 9. Kxd2 Na6 10. Bg3 {Looks best as it covers f2.} 10... Ne4+ 11. Kd1 dxc4 12. e3 b5 {Black is sound pawn up with a good position.}
What I found disappointing was that here (from a Berlin Wall).
This has been reached more than 500 times on RHP and only 3 players have tried 7.Nc3.
Gatsu78 - hklee RHP 2009 (yes the most recent was ten years ago!)
1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 {The Berlin trademark.} 4. O-O Nxe4 5. Re1 {Playable and can lead to some sharp play.} 5... Nd6 6. Nc3 Nxb5 {In the two other games White now played the pitiful 7.Nxb5 and lost.} 7. Nxe5 {Here we go. Black must play 7...Be7.} 7... Nxc3 {Black is a piece up. This swap looks on. We look at 7...Nxe5 next.} 8. Nxc6+ {Same idea but this is a CHECK.} 8... Be7 9. Nxe7 {The correct way to do it.} 9... Nxd1 10. Ng6+ Qe7 {Only move.} 11. Nxe7 Kd8 {Else White plays Ng6+ and Nxh8. White is a piece up (Nxc8) and went onto win.}
And now instead of 7...Nxc3 we look at here:
Black playing 7...Nxe5 but I have no RHP game. I do have one from 1887. (a 132 years ago)
Bachmann - Fiechtl Regensburg 1887
1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. Re1 Nd6 6. Nc3 Nxb5 7. Nxe5 {7...Nxc3 did not fair too well in the last game so let us look at...} 7... Nxe5 8. Rxe5+ Be7 {Not Nxb5 or Rxb5 but} 9. Nd5 d6 {I show a neat trap with 9...0-0 next game.} 10. Rxe7+ Kf8 {Best is now for White to get the Rook out of there with Re1 but sometimes you must gamble.} 11. Qf3 {Now 11...Be6 12.Rxe6 looks good for White but black then has 12...Nd4 and is winning.} 11... f6 {Plausible once Black sees Be6 and Rxe6 but Not Nd4.} 12. d3 {12.d4 now trying to get the Knight to d4 is also on. The coming trick still works.} 12... c6 {Hits the Knight that defends the Rook. All plausible moves. All traps need plausible moves.} 13. Qxf6+ {A memorable way to wrap things up.} 13... gxf6 14. Bh6+ Kg8 15. Nxf6 {A three piece checkmate just waiting for an RHP player with a spirit of adventure.}
And I must show this Queen sac that is also hidden in this variation.
1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. Re1 Nd6 6. Nc3 Nxb5 7. Nxe5 Nxe5 8. Rxe5+ Be7 9. Nd5 {Now instead of 9...d6. Black castles.} 9... O-O 10. Nxe7+ Kh8 11. Qh5 {And should Black move or protect the b5 Knight.} 11... Nd6 {Actually here Black is lost no matter what they played. 11..g6 12.Qh4} 12. Qxh7+ Kxh7 13. Rh5# {Checkmate. Look at the defensive tries instead of 11...Nd6 to confirm for yourself Black is lost.}
Hope you mange to solve the mate in two with all the clues.
[FEN "8/8/1B3p2/8/8/n6K/8/Qb5k w - - 0 1"]
1. Kg3 {White must now checkmate on the very next move.} 1... f5 {1... Nb5 or 1...Nc4 2. Qxb1 mate and 1... Nc2 2. Qa8 is mate. 1...f5 is the only legal move left.} 2. Qh8# {The clues were Qa1-a8 mate and Qa1-h8 mate in the two RHP games.}
The thread accompanying this blog is
Thread 180911 
A very powerful stuff!!! 😍
My solution was Qd4 on the way to Qg1 (maybe with a brief interlude where White's King has to dodge the Black Bishop).