MESON Chess Problem Database

Problem Display
PID: 233314 (4R2B/2p3n1/4N1p1/rQp1kpp1/2B3r1/3P2b1/pP4P1/K7 w - - 0 1)

Kofman, Rafael Moiseevich

Chess Life, 1969

4R2B/2p3n1/4N1p1/rQp1kpp1/2B3r1/3P2b1/pP4P1/K7

#2

9 + 11

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Sxc5+?
      • 1...Kd4
        • 2.Sb3#
      • 1...Kd6
        • 2.Sb7#
      • 1...Kf6
        • 2.Sd7#
      • 1...Kf4!
    • 1.Sxg7+?
      • 1...Kd4
        • 2.Sxf5#
      • 1...Kd6
        • 2.Re6#
      • 1...Kf6
        • 2.Sh5#
      • 1...Kf4!
    • 1.Sd8+?
      • 1...Kd4
        • 2.Sc6#
      • 1...Kd6
        • 2.Sb7#
        • 2.Sf7#
        • 2.Qc6#
      • 1...Kf6
        • 2.Re6#
      • 1...Kf4!
    • 1.Sf8+?
      • 1...Kf4
        • 2.Sxg6#
      • 1...Kd6
        • 2.Qd7#
      • 1...Kf6
        • 2.Sd7#
        • 2.Sh7#
      • 1...Kd4!
    • 1.Qc6?
      • threat
        • 2.Bxg7#
      • 1...Kf6
        • 2.Sf4#
      • 1...f4!
    • 1.Qd7?
      • threat
        • 2.Bxg7#
      • 1...Kf6
        • 2.Bxg7#
        • 2.Qxg7#
      • 1...f4!
    • 1.Qxc5+?
      • 1...Kf6
        • 2.Rf8#
      • 1...Rxc5!
  • Keys
    • 1.Sxg5+!
      • 1...Kd4
        • 2.Sf3#
      • 1...Kf4
        • 2.Sh3#
      • 1...Kd6
        • 2.Sf7#
      • 1...Kf6
        • 2.Sh7#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(G);CHECK,XP(e)
      • Vars
        • K(f);S_FLIGHT::S(G)
        • K(f);N_SPINS(k),S_FLIGHT::S(G)
      • Refutation
        • K(f);N_SPINS(k),S_FLIGHT
    • Try
      • S(G);CHECK,XS(k)
      • Vars
        • K(f);N_SPINP(e),S_FLIGHT::B(I)+S(G),DCHECK,XP(g)
        • K(f);N_SPINP(e),S_FLIGHT::R1(H)
        • K(f);N_SPINP(e),S_FLIGHT::B(I)+S(G),DCHECK
      • Refutation
        • K(f);N_SPINP(e),S_FLIGHT
    • Try
      • S(G);CHECK
      • Vars
        • K(f);N_SPINP(e),S_FLIGHT::S(G)
        • K(f);N_SPINP(e),S_FLIGHT::R1(H)
      • Refutation
        • K(f);N_SPINP(e),N_SPINS(k),S_FLIGHT
    • Try
      • S(G);CHECK
      • Vars
        • K(f);N_SPINP(e),N_SPINS(k),S_FLIGHT::S(G),XP(i)
        • K(f);N_SPINP(e),N_SPINS(k),S_FLIGHT::QAR1(F)
      • Refutation
        • K(f);N_SPINP(e),S_FLIGHT
    • Try
      • Q(F);N_PINP(e)
      • Threat
        • B(I),XS(k)
      • Vars
        • K(f);S_FLIGHT::QAR(F)+S(G)
      • Refutation
        • P(g);
    • Try
      • Q(F);N_PINP(e)
      • Threat
        • B(I),XS(k)
      • Refutation
        • P(g);
    • Try
      • Q(F);CHECK,XP(e)
      • Vars
        • K(f);S_FLIGHT::R(H)
      • Refutation
        • R(d);XQ(F)
  • Actual
    • S(G);CHECK,XP(h)
    • Vars
      • K(f);N_SPINP(e),S_FLIGHT::S(G)
      • K(f);N_SPINP(e),N_SPINS(k),S_FLIGHT::S(G)
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).