At 4:24, the two alternate wins for the Lucena position are not possible if the Black rook is on d2 instead of a2 - note if Re1 Kg7! and the White king can't get out. With the Black rook on d2, the only way to make progress is the "building a bridge" technique with Rg4!
Assume Black rook is on d2. The line goes as 1 Rg1+ Kh7 2 Ra1 Kg7 3 Ra8 Rd1 4 Rd8! Ra1 5 Kd7 + -. The idea is White transfers the rook via a1-a8-d8 and challenges the Black rook forcing it to leave the d file and once the configuration (white rook on d8 and pawn on e7) is achieved , the white king comes out and eventually chases down the Black rook.
@@sidsriva Interesting. A bit more maneuvering is required, but this line wins without the "building a bridge" moves. It appears the only positions where building a bridge is absolutely necessary involve the b and g pawns, e g. WK on b8, WP on b7, WR on d1, BK on e7, BR on a2 - unless you have an alternative way to win that one also. :)
@@zanti4132 For a knight's pawn (i.e. b and d pawns), the technique which I have described ( "moving the rook to the eighth rank") is not possible as the defender's rook is on the rook's file and thus there is not enough space to manoeuvre and move the rook to the eighth rank. It's important to appreciate that not only you have to move the rook to the eighth rank but also you have to challenge the rook. This is precisely why transferring the rook to c8 (in the position mentioned by you) is not enough as Black keeps his king on d7 and White's king is still imprisioned. Thankfully, " building the bridge" comes to our rescue.
Regarding 40:33: Black can hang in there a little with Rd7, but white just repeats the whole sequence, starting with Ke6, driving the black rook away with the same method.
At 27:39 Kd6 is not the only winning try, Magnus actually lost after the sneaky idea 1.Rd6, he played 1...Ra7+?? expecting 2. Rd7? Ra8 but instead 2.Ke8! is winning, the idea being Kf6 3.e7+ Kg7 4.Rd1 Ra8+ 5.Kd7 Ra7+ 6.Ke6 Ra6+ 7.Rd6 Ra8 8.Rd8 etc. Only 1...Kg6 maintains the draw.
Regarding 9:48: Actually, even with two files in between the king can't simultaneously defend the pawn and interfere with the rook. The problem with three files is that the white king is too far away to block off the a7 square from the rook without losing the pawn.
Ad 17:34: Doesn't white have Rh8 ideas? When the white rook comes to the h file and the white king is on g6, black has to check the white king with his rook.
There are a multitude of videos all showing the same thing....but I lost with two rooks & a bishop (plus 2 pawns) vs two bishops & a rook (+ 5 pawns)... where's the video showing me what tactics I should have used!?
At 4:24, the two alternate wins for the Lucena position are not possible if the Black rook is on d2 instead of a2 - note if Re1 Kg7! and the White king can't get out. With the Black rook on d2, the only way to make progress is the "building a bridge" technique with Rg4!
Assume Black rook is on d2. The line goes as 1 Rg1+ Kh7 2 Ra1 Kg7 3 Ra8 Rd1 4 Rd8! Ra1 5 Kd7 + -. The idea is White transfers the rook via a1-a8-d8 and challenges the Black rook forcing it to leave the d file and once the configuration (white rook on d8 and pawn on e7) is achieved , the white king comes out and eventually chases down the Black rook.
@@sidsriva Interesting. A bit more maneuvering is required, but this line wins without the "building a bridge" moves. It appears the only positions where building a bridge is absolutely necessary involve the b and g pawns, e g. WK on b8, WP on b7, WR on d1, BK on e7, BR on a2 - unless you have an alternative way to win that one also. :)
@@zanti4132 For a knight's pawn (i.e. b and d pawns), the technique which I have described ( "moving the rook to the eighth rank") is not possible as the defender's rook is on the rook's file and thus there is not enough space to manoeuvre and move the rook to the eighth rank. It's important to appreciate that not only you have to move the rook to the eighth rank but also you have to challenge the rook. This is precisely why transferring the rook to c8 (in the position mentioned by you) is not enough as Black keeps his king on d7 and White's king is still imprisioned. Thankfully, " building the bridge" comes to our rescue.
Errata: For a knight's pawn ( i.e. b and g pawns ).....
Enjoyed the lesson, thanks
Very well explained!!
15:14 Yea, it was like a private lesson for me
Regarding 40:33: Black can hang in there a little with Rd7, but white just repeats the whole sequence, starting with Ke6, driving the black rook away with the same method.
At 27:39 Kd6 is not the only winning try, Magnus actually lost after the sneaky idea 1.Rd6, he played 1...Ra7+?? expecting 2. Rd7? Ra8 but instead 2.Ke8! is winning, the idea being Kf6 3.e7+ Kg7 4.Rd1 Ra8+ 5.Kd7 Ra7+ 6.Ke6 Ra6+ 7.Rd6 Ra8 8.Rd8 etc. Only 1...Kg6 maintains the draw.
Regarding 9:48: Actually, even with two files in between the king can't simultaneously defend the pawn and interfere with the rook. The problem with three files is that the white king is too far away to block off the a7 square from the rook without losing the pawn.
Very nice video😊😊❤❤ I really appreciate you
Ad 17:34: Doesn't white have Rh8 ideas? When the white rook comes to the h file and the white king is on g6, black has to check the white king with his rook.
Gwan me youth. Young boss.
There are a multitude of videos all showing the same thing....but I lost with two rooks & a bishop (plus 2 pawns) vs two bishops & a rook (+ 5 pawns)... where's the video showing me what tactics I should have used!?
Please TH-cam - there are 10 to the 99999999999 positions in chess - please address the one that happened to me yesterday 😳😳
@@mcronrn Yes. don't recall exactly, but I suspect my post was tongue in cheek. Sorry if it offended...should I delete it?
Thanks 😊🙏a lot
Caleb is good at explaining but too fast I feel. If he teaches in the style of Akobian or Seirawan then he is the best.
I prefer it this way personally
The Akobian/Seirawan/Denby approach is best
Pawn to e8 and we are great.