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Puzzle of the week #54

Level: 
3-Bishop
-r-----k
-----Rrp
---p----
-N-Bb---
P---p---
-QR---pq
-P---P--
------K-

Darren has been doing some very good puzzle solving work in the past couple of months. A few times his solutions have been chosen as the most interesting ones and have been posted here, including the one below! Tonight I decided to make it a "Darren week" since he has been the first one in a long time to come at the club (last week) and propose a puzzle. He receives full pointsi (10) for this contribution, because the simple fact of looking for an interesting puzzle means work done! The above position has occured in the game A. Kosten - Chandler, Hastings 1991. Darren challenges you to find the solution for:
Black to play and matei in 5
Total available pointsi for this puzzle is 10. The answers will be published next week together with puzzle #55.

Puzzle #53 solution:
Darren's solution:
"This week's puzzle was quite interesting. I tried everything from 1.Qxh3 ... to 1.Ne1 ... At some point I realized that White must keep Black's Queeni pinned, to force a movei. And then I saw the solution: 1.Qa8!! ... White's Queeni journeys to the end of the Earth to win the game. If Black takes the Queeni, White plays 1... Qxa8 2.Rf1# ... If Black moves his Queeni elsewhere along the long diagonal, White takes it and mates. And if Black plays 1... Kg1, White plays 2.Qa1# mating because Black's Queeni is pinned. 1.Qe4 ... fails because on the capturei of the Queeni the f5 Rooki is pinned, Qd5 and Qc6 because on 1... Kg1 White's Queeni cannot reach the first ranki, and Qb7 because Black can take the queeni with checki."

Correct solutions:
Darren, Mark, Andy Q, Joshua, John, Wilson, Katerina - 10 pointsi
James, Jeremy, Jacky - 9 pointsi
Andy Y, Karl, Nathaniel - 1 point
Each wrong try gets a 1 point deduction in case of providing the correct solution

STANDINGS

Darren, Mark, Andy Q, Joshua, John, Wilson, Katerina - 10 pointsi
James, Jeremy, Jacky - 9 pointsi
Andy Y, Karl, Nathaniel - 1 point

Comment: 

Final blow (part 1)