MESON Chess Problem Database

Problem Display
PID: 193550 (8/8/8/5B2/3N2p1/K2P1rR1/1P1k1P1R/7Q w - - 0 1)

Blake, Percy Francis

Albino, 1915

8/8/8/5B2/3N2p1/K2P1rR1/1P1k1P1R/7Q

#2

9 + 3

3713 Snap 2019
6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rxf2
      • 2.Rxf2#
    • 1...Rxd3+
      • 2.Rxd3#
    • 1...Re3
      • 2.fxe3#
    • 1...Rxf5
      • 2.f4#
  • Tries
    • 1.Sb3+?
      • 1...Kc2
        • 2.Qc1#
      • 1...Ke2!
    • 1.Sxf3+?
      • 1...Kc2
        • 2.d4#
      • 1...Ke2
        • 2.Qe1#
      • 1...gxf3!
    • 1.Rxf3?
      • 1...g3
        • 2.fxg3#
      • 1...gxf3!
  • Keys
    • 1.Qg1!
      • 1...Rxd3+
        • 2.Rxd3#
      • 1...Rxf2
        • 2.Rxf2#
      • 1...Rxg3
        • 2.fxg3#
      • 1...Rxf5
        • 2.f4#
      • 1...Rf4
        • 2.f3#
      • 1...Re3
        • 2.fxe3#

This anticipates 78017(1956)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(b);N_PINP(F),OGATE,P_SPINR(b),XP(C)::R(D),XR(b)
    • R(b);CHECK,OGATE,XP(F)::R1(G),XR(b)
    • R(b);OGATE::R(D)+P(C),XR(b)
    • R(b);N_PINP(F),OGATE,XB(I)::R(D)+P(C)
  • Tries
    • Try
      • S(H);CHECK,N_SPINP(F)
      • Vars
        • K(a);P-FLIGHT::QAR1(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • S(H);CHECK,N_SPINP(F),XR(b)
      • Vars
        • K(a);P-FLIGHT::B(I)+P(F)
        • K(a);P-FLIGHT::QAR1(A)
      • Refutation
        • P(c);XS(H)
    • Try
      • R(G);N_SPINP(F),XR(b)
      • Vars
        • P(c);OGATE::R(D)+P(C),XP(c)
      • Refutation
        • P(c);XR(G)
  • Actual
    • Q(A);
    • Vars
      • R(b);CHECK,OGATE,XP(F)::R1(G),XR(b)
      • R(b);N_PINP(F),OGATE,P_SPINR(b),XP(C)::R(D),XR(b)
      • R(b);OGATE,XR(G)::R(D)+P(C),XR(b)
      • R(b);N_PINP(F),OGATE,XB(I)::R(D)+P(C)
      • R(b);N_PINP(F),OGATE::R(D)+P(C)
      • R(b);OGATE::R(D)+P(C),XR(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).