Hi Thar.
No riddle. I don't do riddles. That's SG Country.
(has anyone tried his 6.a8xR mate puzzle - it's a ball buster.)
Here, White to play.
These are critical hot positions.
Pawns on the sixth, open King, Rook stuck in the corner.
(And look at the Black King - one clean check will see him off.)
White's has no chance of getting his Rook into the game but
Bishop g4 hitting the Queen and Black's a8 Rook appears on e8.
That is what I would be thinking and that is what I saw.
(a visualised postion)
Every position that has a check in it or tactical features
like those mentioned above must be given the 100% work over.
and that means
No Automatic Moves.
White played 20. Rxd2
And how long did you take to play 21.exd2...seconds I'm guessing.
Why not 20...Bg4
The Queen moves 21.Qe1 and 21..e2+ is curtains.
OK you are thinking. No Big deal, I won anyway.
Yes but do you realise how lucky you were?
And after 20 Rxd2 exd2.
White to play.
How long did White take to play 21.Qxd2.
I gave the (check all checks) clue.
White cannot play 21.QxR because 21...d2-d1=Q+.
However.....21.Bg7+
Black cannot play 22.RxB as Qe8+ is mate next move.
(I told you one clean check would kill of that King.)
So Black has to take with the King 21...Kxg7+ 22.QxR
CHECK!
And that must be, at the very least, a perpetual.
If the King tries to run and strays onto the f-file (f5) then Ke2
and Rf1+ is coming. It must be a perp.