MESON Chess Problem Database

Problem Display
PID: 17046 (4Nb2/5b2/1pp2prp/2k1q2R/2B5/3R4/Q1NK1P2/6B1 w - - 0 1)

Chandler, Guy Wills

To Alain White, 1945

4Nb2/5b2/1pp2prp/2k1q2R/2B5/3R4/Q1NK1P2/6B1

#2

9 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qg5+
      • 2.f4#
    • 1...Rg3
      • 2.fxg3#
  • Tries
    • 1.Se3?
      • threat
        • 2.Qa3#
      • 1...Kb4
        • 2.Qa3#
      • 1...Bxc4
        • 2.Qxc4#
      • 1...b5!
    • 1.Sd6?
      • threat
        • 2.Se4#
        • 2.Sb7#
        • 2.Qa3#
      • 1...Qg5+
        • 2.f4#
      • 1...Bxc4
        • 2.Qxc4#
        • 2.Qa3#
      • 1...Bd5
        • 2.Sb7#
        • 2.Qa3#
      • 1...b5
        • 2.Qa7#
      • 1...Rg4
        • 2.Sb7#
        • 2.Qa3#
      • 1...Rg5
        • 2.Sb7#
        • 2.Qa3#
      • 1...f5
        • 2.Sb7#
        • 2.Qa3#
      • 1...Bxd6!
    • 1.Qb3?
      • threat
        • 2.Qb4#
      • 1...Qg5+
        • 2.f4#
      • 1...b5!
    • 1.Qa4?
      • threat
        • 2.Qb4#
      • 1...Qg5+
        • 2.f4#
      • 1...b5!
  • Keys
    • 1.Rc3!
      • threat
        • 2.Qa3#
      • 1...Qd5+
        • 2.Bd3#
      • 1...Qg5+
        • 2.f4#
      • 1...Bxc4
        • 2.Qxc4#
      • 1...b5
        • 2.Qa7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • Q(b);CHECK,S_CUTR(f)::B(A)+P(E)
    • R(f);OGATE::B(A)+P(E),XR(f)
  • Tries
    • Try
      • S(C);
      • Threat
        • QAB(B)
      • Vars
        • K(a);N_SPINQ(b),S_FLIGHT::QAB1(B)
        • B(h);OGATE,XB(G)::QAR1(B),XB(h)
      • Refutation
        • P(c);
    • Try
      • S(I);
      • Threat
        • DUALS(3)
      • Vars
        • Q(b);CHECK,S_CUTR(f)::B(A)+P(E)
        • P(c);OGATEB::QAB(B)
      • Refutation
        • B(i);XS(I)
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • Q(b);CHECK,S_CUTR(f)::B(A)+P(E)
      • Refutation
        • P(c);
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • Q(b);CHECK,S_CUTR(f)::B(A)+P(E)
      • Refutation
        • P(c);
  • Actual
    • R(F);
    • Threat
      • QAB(B)
    • Vars
      • Q(b);CHECK,S_CUTB(h)::R(F)+B(G)
      • Q(b);CHECK,S_CUTR(f)::B(A)+P(E)
      • B(h);OGATE,P_SPINB(h),XB(G)::QAR1(B),XB(h)
      • P(c);OGATEB::QAB(B)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).