MESON Chess Problem Database

Problem Display
PID: 55059 (1qn5/5pRK/r1Q2Np1/p2P1k2/r1n4R/p2PpN2/3p2P1/bB6 w - - 0 1)

Smedley, Don A

2nd Prize, The Problemist, 1977

1qn5/5pRK/r1Q2Np1/p2P1k2/r1n4R/p2PpN2/3p2P1/bB6

#2

10 + 13

3750 FIDE Album (1977-1979) 1984
4640 Chess Wizardry: The New ABC of Chess Problems 1996
15513 Selected Chess Problems of Colin Sydenham 2015

SOLUTION

  • SOUND
  • Sets
    • 1...Qh2
      • 2.dxc4#
      • 2.d4#
    • 1...Qg3
      • 2.dxc4#
      • 2.d4#
    • 1...Qa7
      • 2.dxc4#
      • 2.d4#
    • 1...Qc7
      • 2.dxc4#
      • 2.d4#
    • 1...Qa8
      • 2.dxc4#
      • 2.d4#
    • 1...Bb2
      • 2.dxc4#
      • 2.d4#
    • 1...S4b6
      • 2.d4#
    • 1...S8b6
      • 2.dxc4#
      • 2.d4#
    • 1...g5
      • 2.Rxg5#
  • Tries
    • 1.Sd4+?
      • 1...Ke5
        • 2.Sd7#
        • 2.Re4#
      • 1...Kg5
        • 2.Rg4#
      • 1...Bxd4!
    • 1.Qd7+?
      • 1...Kxf6
        • 2.Rxf7#
        • 2.Qxf7#
      • 1...Re6!
  • Keys
    • 1.Sh5!
      • threat
        • 2.g4#
      • 1...gxh5
        • 2.Rg5#
      • 1...Qg3
        • 2.Sxg3#
        • 2.dxc4#
        • 2.d4#
      • 1...Qf4
        • 2.Rxf4#
      • 1...Sb2
        • 2.Rxf7#
      • 1...Se5
        • 2.Sg3#
      • 1...S4b6
        • 2.d4#
      • 1...S4d6
        • 2.Qd7#

This is a version of 145351

Version by A. C. Reeves.

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • S(f);S_CUTQ(l)::B(A)+P(C)
    • P(j);OGATE::R1(I),XP(j)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • K(h);P-FLIGHT,P_SPINP(j)::R1(E)
      • Refutation
        • B(a);XS(D)
    • Try
      • Q(G);CHECK
      • Refutation
        • R(i);P_SPINR(i)
  • Actual
    • S(H);
    • Threat
      • P(B)
    • Vars
      • P(j);OGATE,XS(H)::R1(I)
      • Q(l);N_GUARD::R1(E),XQ(l)
      • S(f);S_CUTB(a)::R(I),XP(k)
      • S(f);S_CUTQ(l)::S(H)
      • S(f);S_CUTQ(l)::B(A)+P(C)
      • S(f);S_CUTR(i)::QAB(G)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).