MESON Chess Problem Database

Problem Display
PID: 233316 (4R2B/2p2pnP/4N1p1/rQp1k1p1/4B1r1/6b1/pP4P1/K7 w - - 0 1)

Kofman, Rafael Moiseevich

Chess Life, 1969

4R2B/2p2pnP/4N1p1/rQp1k1p1/4B1r1/6b1/pP4P1/K7

#2

9 + 11

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kf6
      • 2.Bxg7#
  • Tries
    • 1.Sf4+?
      • 1...Kd4
        • 2.Qd3#
      • 1...Kd6
        • 2.Qd3#
        • 2.Qc6#
      • 1...Kf6
        • 2.Sd5#
        • 2.Qc6#
      • 1...Kxf4!
    • 1.Sxg7+?
      • 1...Kd4
        • 2.Sf5#
        • 2.Qd3#
      • 1...Kd6
        • 2.Qd3#
        • 2.Qc6#
      • 1...Kf6
        • 2.Sf5#
        • 2.Sh5#
        • 2.Se6#
      • 1...Kf4!
    • 1.Sf8+?
      • 1...Kd4
        • 2.Qd3#
      • 1...Kd6
        • 2.Qd3#
        • 2.Qc6#
        • 2.Qd7#
      • 1...Kf6
        • 2.Sd7#
      • 1...Kf4!
  • Keys
    • 1.Sxc7+!
      • 1...Kd4
        • 2.Qd3#
      • 1...Kf4
        • 2.Sd5#
      • 1...Kd6
        • 2.Qc6#
      • 1...Kf6
        • 2.Sd5#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(f);N_SPINP(e),S_FLIGHT::B(I),XS(k)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(f);N_SPINP(e),S_FLIGHT::QAR1(E)
      • Refutation
        • K(f);N_SPINP(e),N_SPINS(k),S_FLIGHT,XS(F)
    • Try
      • S(F);CHECK,XS(k)
      • Refutation
        • K(f);N_SPINP(e),S_FLIGHT
    • Try
      • S(F);CHECK
      • Vars
        • K(f);N_SPINP(e),S_FLIGHT::QAR1(E)
        • K(f);N_SPINP(e),S_FLIGHT::S(F)
      • Refutation
        • K(f);N_SPINP(e),N_SPINS(k),S_FLIGHT
  • Actual
    • S(F);CHECK,XP(i)
    • Vars
      • K(f);N_SPINP(e),S_FLIGHT::QAR1(E)
      • K(f);N_SPINP(e),N_SPINS(k),S_FLIGHT::S(F)
      • K(f);N_SPINP(e),N_SPINS(k),S_FLIGHT::QAR1(E)
      • K(f);N_SPINP(e),S_FLIGHT::S(F)
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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).