Puzzle of the week #369

Submitted by Eugen on Sun, 04/21/2019 - 22:12
Freeing up space
Chess Diagram
[Event "Puzzle #369"][Date "2019.04.21"][Result "0-1"][SetUp "1"][FEN "7r/2r3p1/1k3p2/1p1PpP2/pKp1P3/P3R2P/1P3R2/8 b - - 0 1"]
Material is equal in this complex endgame position. It is black to move and your tasks are:
a) Decide who stands better and why?
b) Why is it called a complex endgame?
c) Find the best line for black to win the game

Total available points for this puzzle is 25. The answers will be published next time together with puzzle #370.

Puzzle #368 solution:
Game Avrukh - Mikhalevski, Israel Ch. 1998. This week's best answers are a combination of the top 3 scorers:
a) The black pieces are well placed because one has an open file while the other has a semi open file. Also it has an really active bishop on the longest diagonal.The value are really good for all its pieces.
White 's rook is good because he's controlling a file and rank. Its queen is ok placed but can be attacked on the open file. I will give 7.5 points for the queen and white's rook 5 because it covers a file and a rank. I will give black's bishop a 4 because the bishop is making the king have limited moves.
The two rooks I will give 5 because they can shift to couple different ranks.
b) Be really aggressive or else white will be up a queen for a bishop and a rook

[Event "Puzzle #368"][Date "2019.04.15"][Result "0-1"][SetUp "1"][FEN "8/1pr3kp/p2r2p1/4p3/3bP1P1/1R6/P6P/1K3Q2 b - - 0 1"]1... Rf7 2. Qd1 (2. Rf3 Rb6+ {White's Rook cannot return to protect the King} 3. Kc2 Rc7+ {Neither white piece can defend its King} 4. Kd2 Rb2+ 5. Kd1 Rb1+) (2. Qh3 Rdf6 3. Rd3 Rf1+ 4. Kc2 R7f2+ 5. Rd2 Rf3 6. Qh4 Rc3+ 7. Kb2 Rh3+) 2... Rdf6 3. Kc2 Rf1 {White's Queen is lost}

Correct solutions:
Matthew, Aiden - 20 points
Eric - 18 points
Walter - 15 points
Glyn, Joey - 10 points
Coby, Brian, Lucas - 6 points

Aiden - 210 points
Matthew - 206 points
Eric - 189 points
Joey - 160 points
Coby - 152 points
Walter - 150 points
Zhengyu - 147 points
Glyn - 128 points
Brian - 112 points
Lucas - 110 points
Mengbai - 73 points
Lyvia - 70 points
Blake - 69 points