16 Mar 17
1 edit
Originally posted by vanderveldeRd1 ..Ke5 as soon as the king steps out from behind the pawn black checks him. If I make a waiting move with the rook, the black king king simply shuffles up and down the e file
Use Rook to chase black King away and the advance with your King.
It should be egal which checks you give, as far you manage to advance with your King.
16 Mar 17
Originally posted by robbie carrobieThe position you want to head for is called the Lucena position. It's covered on Wikipedia and other online resources. As Vandervelde said it's largely a matter of keeping black's king out of the way and then using the rook to shield the king from checks once the pawn is far enough advanced to promote.
Its doing my head in. Black just played ...Kd4 which is a mistake, but I cannot work out how to promote the pawn.
[fen]1r6/8/8/8/1P1k4/1K6/8/2R5 w - - 0 1[/fen]
16 Mar 17
2 edits
the idea is to reach the Lucena position, I had two computers play each other and this was the solution.
1. Rc6 Kd5 2. Ra6 Rc8 3. b5 Rc4 4. Ra7 Rf4 5. Rc7 Re4 6. Rc8 Rg4 7. Kc3 Rg1 8. Kb4 Rb1+ 9. Ka5 Kd6 10. b6 Kd7 11. Rc2 Kd6 12. Ka6 Ra1+ 13. Kb7 Kd7 14. Kb8 Rb1 15. b7
16 Mar 17
2 edits
Originally posted by DeepThoughtI understand the Lucena position and I understand thats what I should be aiming form, its an entirely different matter getting there though. There should be a how to reach the Lucena position article somewhere. I don't just want to memorise the moves, I want to understand what I am supposed to be doing.
The position you want to head for is called the Lucena position. It's covered on Wikipedia and other online resources. As Vandervelde said it's largely a matter of keeping black's king out of the way and then using the rook to shield the king from checks once the pawn is far enough advanced to promote.
16 Mar 17
Originally posted by robbie carrobieI am not sure Rd1 even wins.
Rd1 ..Ke5 as soon as the king steps out from behind the pawn black checks him. If I make a waiting move with the rook, the black king king simply shuffles up and down the e file
Better seems 1.Rc5 followed by 2.Rg5 allowing the b-pawn to advance, and keeping the bK in the southern half of the board.
16 Mar 17
1 edit
Originally posted by BigDoggProblemIt doesn't, Rd1 is useless, computer gives Rc6 as first move. I have no idea what is going on even with the solution.
I am not sure Rd1 even wins.
Better seems 1.Rc5 followed by 2.Rg5 allowing the b-pawn to advance, and keeping the bK in the southern half of the board.
16 Mar 17
Originally posted by robbie carrobieYep, you're right. I have 5 piece table bases on a laptop that I don't normally use and just checked. The winning moves are Rc5, Ka4, Ra1 and Rc6; all other moves draw except Rc8. Rc5 is the fastest win, I think it's a matter of getting black to drop moves with his rook. The Lucena method does not seem to be involved, which is what is confusing about it. There's more than one option per move on most of the moves which get to checkmate as fast, but the fastest route to checkmate according to EGTB is as follows:
Its still doing my head in. 1. Rc5 seems like winning as well.
