MESON Chess Problem Database

Problem Display
PID: 17914 (k3n3/qR2R3/4N3/2p5/2P5/2Q5/8/4K3 w - - 0 1)

Kipping, Cyril Stanley

The Problemist, 1951

k3n3/qR2R3/4N3/2p5/2P5/2Q5/8/4K3

#2

6 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Qa1+
      • 2.Qxa1#
    • 1...Qa3
      • 2.Qxa3#
    • 1...Qa5
      • 2.Qxa5#
  • Tries
    • 1.Rxe8+?
      • 1...Qb8
        • 2.Rexb8#
      • 1...Kxb7!
    • 1.Qa1?
      • threat
        • 2.Qxa7#
      • 1...Qa5+
        • 2.Qxa5#
      • 1...Qa2
        • 2.Qxa2#
      • 1...Qa3
        • 2.Qxa3#
      • 1...Qa4
        • 2.Qxa4#
      • 1...Qa6
        • 2.Qxa6#
      • 1...Qxa1+!
    • 1.Qa5?
      • threat
        • 2.Qxa7#
      • 1...Qa6
        • 2.Qd8#
        • 2.Qxa6#
      • 1...Qxa5+!
    • 1.Qa3?
      • threat
        • 2.Qxa7#
      • 1...Qa5+
        • 2.Qxa5#
      • 1...Qa4
        • 2.Qxa4#
      • 1...Qa6
        • 2.Qxa6#
      • 1...Qxa3!
  • Keys
    • 1.Qf3!
      • 1...Qa1+
        • 2.Rb1#
      • 1...Qa5+
        • 2.Rb4#
      • 1...Qxb7
        • 2.Qxb7#
      • 1...Qb6
        • 2.Rxb6#
      • 1...Qb8
        • 2.Ra7#
      • 1...Qa2
        • 2.Rb1#
        • 2.Rb2#
        • 2.Rb3#
        • 2.Rb4#
        • 2.Rb5#
        • 2.Rb6#
        • 2.Rxe8#
      • 1...Qa3
        • 2.Rb3#
        • 2.Rxe8#
        • 2.Qxa3#
      • 1...Qa4
        • 2.Rb5#
      • 1...Qa6
        • 2.Rxe8#
      • 1...Sd6
        • 2.Sc7#
      • 1...Sf6
        • 2.Sc7#
      • 1...Sc7
        • 2.Sxc7#
      • 1...Sg7
        • 2.Sc7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 9
    • REMOVED MATES = 1
  • Sets
    • Q(b);CHECK,OGATEB::QAB(B),XQ(b)
    • Q(b);OGATEB::QAR(B),XQ(b)
    • Q(b);OGATEB,P_PINQ(B)::QAR(B),XQ(b)
  • Tries
    • Try
      • R(F);CHECK,XS(d)
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::R1(F),XQ(b)
      • Refutation
        • K(c);S_FLIGHT,XR(E)
    • Try
      • Q(B);P_PINQ(b)
      • Threat
        • QAR1(B),XQ(b)
      • Vars
        • Q(b);CHECK,OGATEB::QAR(B),XQ(b)
        • Q(b);OGATEB::QAR(B),XQ(b)
        • Q(b);OGATEB::QAR2(B),XQ(b)
      • Refutation
        • Q(b);CHECK,N_SPINQ(b),XQ(B)
    • Try
      • Q(B);P_PINQ(b)
      • Threat
        • QAR1(B),XQ(b)
      • Refutation
        • Q(b);CHECK,N_SPINQ(b),XQ(B)
    • Try
      • Q(B);P_PINQ(b)
      • Threat
        • QAR1(B),XQ(b)
      • Vars
        • Q(b);CHECK,OGATEB::QAR(B),XQ(b)
        • Q(b);OGATEB::QAR(B),XQ(b)
        • Q(b);OGATEB::QAR2(B),XQ(b)
      • Refutation
        • Q(b);N_SPINQ(b),XQ(B)
  • Actual
    • Q(B);
    • Vars
      • Q(b);CHECK,N_GUARD::QAB(B)+R(E)
      • Q(b);OGATE,P_SPINQ(b),XR(E)::QAB1(B),XQ(b)
      • Q(b);N_GUARD::QAB(B)+R(E),XQ(b)
      • Q(b);SBLOCK::QAB(B)+R(E),DCHECK
      • Q(b);N_GUARD::QAB(B)+R(E)
      • Q(b);N_GUARD::R(F),XS(d)
      • S(d);N_GUARD::S(D)
      • S(d);N_GUARD::S(D),XS(d)
HTML5 logo

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).