MESON Chess Problem Database

Problem Display
PID: 194102 (2b5/n1N3b1/1p6/5P2/r2kNQP1/r1p4K/PR2pP2/BBR2n2 w - - 0 1)

White, Alain Campbell

Pittsburgh Gazette-Times, 1917

2b5/n1N3b1/1p6/5P2/r2kNQP1/r1p4K/PR2pP2/BBR2n2

#2

12 + 10

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rb4
      • 2.Rxb4#
    • 1...Rc4
      • 2.Qd6#
    • 1...Ra5
      • 2.Rb4#
    • 1...Ra6
      • 2.Rb4#
    • 1...cxb2+
      • 2.Sg3#
  • Tries
    • 1.Qd2+?
      • 1...Kc4
        • 2.Qd3#
        • 2.Qd5#
      • 1...Ke5
        • 2.Qd6#
        • 2.f4#
      • 1...cxd2+
        • 2.Rb3#
      • 1...Sxd2!
    • 1.Qe3+?
      • 1...Kc4
        • 2.Sd6#
        • 2.Bd3#
        • 2.Qd3#
      • 1...Ke5
        • 2.f4#
      • 1...Sxe3!
  • Keys
    • 1.Qd6+!
      • 1...Kc4
        • 2.Bd3#
        • 2.Qd3#
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 5
  • Sets
    • R(e);N_GUARD::R(E),XR(e)
    • R(e);SBLOCK::QAR2(I)
    • R(e);N_GUARD::R(E)
    • P(d);CHECK,P_SPINP(d),XR(E)::QAR(I)+S(H)
  • Tries
    • Try
      • Q(I);CHECK
      • Vars
        • P(d);CHECK,S_CUTS(a),XQ(I)::B(A)+R(E)
      • Refutation
        • S(a);XQ(I)
    • Try
      • Q(I);CHECK
      • Vars
        • K(f);S_FLIGHT::P(F)
      • Refutation
        • S(a);XQ(I)
  • Actual
    • Q(I);CHECK
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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).