MESON Chess Problem Database

Problem Display
PID: 260091 (KnBb1nR1/1N1rPkqp/3B1pRr/1Q2P3/8/8/8/8 w - - 0 1)

Lipton, Michael

The Problemist, 1997

KnBb1nR1/1N1rPkqp/3B1pRr/1Q2P3/8/8/8/8

#2

9 + 9

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kxg8
      • 2.exf8Q#
      • 2.exf8R#
    • 1...Rxd6
      • 2.R6xg7#
      • 2.R8xg7#
    • 1...Rxb7
      • 2.R6xg7#
      • 2.R8xg7#
    • 1...Rc7
      • 2.R6xg7#
      • 2.R8xg7#
    • 1...Rxe7
      • 2.R6xg7#
      • 2.R8xg7#
    • 1...Se6
      • 2.e8Q#
    • 1...Sxg6
      • 2.Qc4#
      • 2.Qb3#
      • 2.Qd5#
      • 2.e8Q#
  • Tries
    • 1.R6xg7+?
      • 1...Ke8
        • 2.Rxf8#
        • 2.exd8Q#
        • 2.exd8R#
        • 2.exf8Q#
        • 2.exf8R#
      • 1...Ke6!
    • 1.R8xg7+?
      • 1...Ke8
        • 2.exd8Q#
        • 2.exd8R#
        • 2.exf8Q#
        • 2.exf8R#
      • 1...Ke6!
    • 1.e8Q+?
      • 1...Kxg8
        • 2.Qxf8#
      • 1...Kxe8!
  • Keys
    • 1.e6+!
      • 1...Kxe6
        • 2.exd8S#
      • 1...Kxg6
        • 2.exf8S#
      • 1...Ke8
        • 2.exd8Q#
        • 2.exd8R#
      • 1...Kxg8
        • 2.exf8Q#
        • 2.exf8R#
      • 1...Sxe6
        • 2.e8Q#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(d);N_GUARD,P_SPINQ(e),S_FLIGHT,XR(I)::PXS(i)=Q
    • S(i);::P=Q
  • Tries
    • Try
      • R(D);CHECK,XQ(e)
      • Refutation
        • K(d);P_SPINR(c),S_FLIGHT
    • Try
      • R(I);CHECK,XQ(e)
      • Refutation
        • K(d);P_SPINP(a),P_SPINR(c),S_FLIGHT
    • Try
      • P(F);CHECK
      • Vars
        • K(d);N_GUARD,P_SPINQ(e),P_SPINS(i),S_FLIGHT,XR(I)::QAR1(F),XS(i)
      • Refutation
        • K(d);P_SPINR(c),P_SPINS(i),S_FLIGHT,XQ(F)
  • Actual
    • P(B);CHECK
    • Vars
      • K(d);N_GUARD,P_SPINP(a),P_SPINR(c),S_CUTS(i),S_FLIGHT,XP(B)::PXB(h)=S
      • K(d);N_GUARD,P_SPINQ(e),S_FLIGHT,XR(D)::PXS(i)=S
      • K(d);N_GUARD,P_SPINR(c),P_SPINS(i),S_FLIGHT::PXB(h)=Q
      • K(d);N_GUARD,P_SPINQ(e),S_FLIGHT,XR(I)::PXS(i)=Q
      • S(i);XP(B)::P=Q
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).