Puzzle of the week #368

Submitted by Eugen on Mon, 04/15/2019 - 06:59

Relative value

Chess Diagram
[Event "Puzzle #368"][Date "2019.04.15"][Result "0-1"][SetUp "1"][FEN "8/1pr3kp/p2r2p1/4p3/3bP1P1/1R6/P6P/1K3Q2 b - - 0 1"]
It is black's turn to move and it should analyse the position careful to make the right choice. An important aspect to consider is the relative value of the pieces. Your tasks:
a) Decide what is the relative value of the remaining pieces as we did in class
b) What should black do to fight for a win?
c) Find the best winning line you can think of

Total available points for this puzzle is 25. The answers will be published next time together with puzzle #369.

Puzzle #367 solution:
Ceteras 2007. This week's best answers are by the top scorers:
a) Material is equal.
Kings: white's King is more exposed than the black one
Black's knight is way better centralized
The b3-pawn is also under attack
Therefore black is better, especially since white is not attacking him.
b) Black should win material here since he has better positioning.
[Event "Puzzle #367"][Date "2019.04.07"][Result "0-1"][SetUp "1"][FEN "8/pk3p2/1p4p1/2p1q2p/2Pn3P/1P1P2P1/1N3P2/3Q2K1 b - - 0 1"]1... Qe2 ({Not as good is} 1... Ne2+ 2. Kf1 Qxb2 3. Qxe2 Qxe2+ (3... Qxb3 {This Queen endgame is not easy to win even up a pawn because Queens can give a lof of checks}) 4. Kxe2 {Black has no material advantage after these exchanges}) 2. Qxe2 Nxe2+ 3. Kf1 Nd4 (3... Nc1 4. Ke1 Nxb3) 4. Ke1 Nxb3 {Black is winning}

Correct solutions:
Matthew, Eric, Aiden - 25 points
Joey - 20 points
Walter, Coby, Zhengyu - 15 points
Glyn, Lucas - 10 points
Brian - 5 points

Aiden - 190 points
Matthew - 186 points
Eric - 171 points
Joey - 150 points
Zhengyu - 147 points
Coby - 146 points
Walter - 135 points
Glyn - 118 points
Brian - 106 points
Lucas - 104 points
Mengbai - 73 points
Lyvia - 70 points
Blake - 69 points