MESON Chess Problem Database

Problem Display
PID: 287457 (K3k3/2B1P3/4Q3/2R4N/8/2b5/8/1B3rr1 w - - 0 1)

Okaya, Ayako

Comm., Problem Paradise, 2014

K3k3/2B1P3/4Q3/2R4N/8/2b5/8/1B3rr1

#2

7 + 4

15601 Albrecht-Leiss-Degener Collection 2026

SOLUTION

  • SOUND
  • Tries
    • 1.Bg6+?
      • 1...Rf7
        • 2.Bxf7#
      • 1...Rxg6!
    • 1.Bf4?
      • threat
        • 2.Rc8#
      • 1...Ba5
        • 2.Sf6#
      • 1...Rd1!
    • 1.Be5?
      • threat
        • 2.Rc8#
      • 1...Rd1
        • 2.Sf6#
      • 1...Ba5!
    • 1.Qd7+?
      • 1...Kf7
        • 2.e8Q#
        • 2.e8R#
      • 1...Kxd7!
    • 1.Qc8+?
      • 1...Kf7
        • 2.e8Q#
      • 1...Kxe7!
    • 1.Qc6+?
      • 1...Kf7
        • 2.e8Q#
      • 1...Kxe7!
  • Keys
    • 1.Bg3!
      • threat
        • 2.Rc8#
      • 1...Rd1
        • 2.Bg6#
      • 1...Ba5
        • 2.Sg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • B(A);CHECK
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::B(A),XR(a)
      • Refutation
        • R(b);XB(A)
    • Try
      • B(E);
      • Threat
        • R(B)
      • Vars
        • B(c);N_GUARD::S(C)
      • Refutation
        • R(a);
    • Try
      • B(E);
      • Threat
        • R(B)
      • Vars
        • R(a);N_GUARD::S(C)
      • Refutation
        • B(c);
    • Try
      • Q(D);CHECK
      • Vars
        • K(d);OGATE,S_FLIGHT::P=Q
      • Refutation
        • K(d);S_FLIGHT,XQ(D)
    • Try
      • Q(D);CHECK
      • Vars
        • K(d);OGATE,S_FLIGHT::P=Q
      • Refutation
        • K(d);P-FLIGHT,XP(F)
    • Try
      • Q(D);CHECK
      • Vars
        • K(d);OGATE,S_FLIGHT::P=Q
      • Refutation
        • K(d);P-FLIGHT,XP(F)
  • Actual
    • B(E);
    • Threat
      • R(B)
    • Vars
      • R(a);N_GUARD::B(A)
      • B(c);N_GUARD::S(C)
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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).