MESON Chess Problem Database

Problem Display
PID: 211166 (K7/4kP2/N1B1P1R1/8/5r2/6Qn/4R2B/8 w - - 0 1)

ten Cate, Pieter

The Problemist, 1985

K7/4kP2/N1B1P1R1/8/5r2/6Qn/4R2B/8

#2

9 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Kd6
      • 2.e7#
    • 1...Rf1
      • 2.Qd6#
    • 1...Rf2
      • 2.Qd6#
    • 1...Rf3
      • 2.Qd6#
    • 1...Ra4
      • 2.Qd6#
    • 1...Rb4
      • 2.Qd6#
    • 1...Rc4
      • 2.Qd6#
    • 1...Re4
      • 2.Qd6#
    • 1...Rg4
      • 2.Qd6#
    • 1...Rh4
      • 2.Qd6#
    • 1...Rf5
      • 2.Qd6#
    • 1...Rf6
      • 2.Qd6#
    • 1...Rxf7
      • 2.Qd6#
  • Tries
    • 1.Qxf4?
      • threat
        • 2.Qd6#
        • 2.f8Q#
      • 1...Kd8
        • 2.Qc7#
        • 2.f8Q#
      • 1...Kf8
        • 2.Qd6#
        • 2.Qb4#
        • 2.e7#
      • 1...Sxf4!
    • 1.Qa3+?
      • 1...Kd8
        • 2.Rg8#
        • 2.Qf8#
      • 1...Rb4!
  • Keys
    • 1.Rf6!
      • threat
        • 2.f8Q#
      • 1...Kd6
        • 2.e7#
      • 1...Kxf6
        • 2.f8Q#
      • 1...Kd8
        • 2.f8Q#
      • 1...Kf8
        • 2.e7#
      • 1...Rxf6
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 11
  • Sets
    • K(c);OGATE,P_SPINR(b),S_FLIGHT::R(G)+P(F)
    • R(b);OGATE::QAB1(C)
    • R(b);OGATE,P_PINS(D)::QAB1(C)
    • R(b);OGATE,XP(H)::QAB1(C)
  • Tries
    • Try
      • Q(C);XR(b)
      • Threat
        • DUALS(2)
      • Refutation
        • S(a);XQ(C)
    • Try
      • Q(C);CHECK
      • Refutation
        • R(b);P_SPINR(b)
  • Actual
    • R(G);
    • Threat
      • P=Q
    • Vars
      • K(c);OGATE,P_SPINR(b),S_FLIGHT::R(G)+P(F)
      • K(c);S_FLIGHT,XR(G)::P=Q
      • K(c);S_FLIGHT::P=Q
      • K(c);OGATE,S_FLIGHT::P(F)
      • R(b);OGATE,SBLOCK,XR(G)::QAB1(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).