MESON Chess Problem Database

Problem Display
PID: 30523 (4N3/1B6/4PP2/4k1bR/2p1n2N/Q2Rp2P/4P3/2K5 w - - 0 1)

Cheylan, Yves

1st Prize, The Problemist, 1976

4N3/1B6/4PP2/4k1bR/2p1n2N/Q2Rp2P/4P3/2K5

#2

11 + 5

3771 FIDE Album (1974-1976) 1980
3364 Solving in Style 1985

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe6
      • 2.Qe7#
    • 1...Sd2
      • 2.Qd6#
    • 1...Sf2
      • 2.Qd6#
    • 1...Sc3
      • 2.Qd6#
    • 1...Sg3
      • 2.Qd6#
    • 1...Sd6
      • 2.Qxd6#
    • 1...Sxf6
      • 2.Qd6#
  • Tries
    • 1.Rd4?
      • threat
        • 2.Rxe4#
      • 1...Kxd4
        • 2.Sf3#
      • 1...Kf4
        • 2.Qd6#
      • 1...Kxe6
        • 2.Qe7#
      • 1...Sxf6
        • 2.Qd6#
      • 1...Sd2
        • 2.Qd6#
      • 1...Sf2
        • 2.Qd6#
      • 1...Sc3
        • 2.Qd6#
      • 1...Sg3
        • 2.Qd6#
      • 1...Sd6
        • 2.Qxd6#
      • 1...Sc5!
    • 1.Rd5+?
      • 1...Kxe6
        • 2.Qe7#
      • 1...Kf4!
    • 1.Rxg5+?
      • 1...Kxe6
        • 2.Qe7#
      • 1...Sxg5
        • 2.Qd6#
      • 1...Kf4!
  • Keys
    • 1.Rxe3!
      • threat
        • 2.Qd6#
      • 1...Kd4
        • 2.Sf3#
      • 1...Kf4
        • 2.Rxe4#
      • 1...Kxe6
        • 2.Qe7#

This is a version of 84163

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • K(d);N_SPINB(e),OGATEB,P-FLIGHT,XP(H)::QAR1(C)
    • S(c);N_GUARD::QAB1(C)
    • S(c);N_GUARD::QAB1(C),XS(c)
    • S(c);N_GUARD,XP(I)::QAB1(C)
  • Tries
    • Try
      • R(D);
      • Threat
        • R1(D),XS(c)
      • Vars
        • K(d);N_SPINB(e),S_FLIGHT,XR(D)::S(F)
        • K(d);N_SPINB(e),P_SPINS(c),S_FLIGHT::QAB(C)
        • K(d);N_SPINB(e),OGATEB,P-FLIGHT,XP(H)::QAR1(C)
        • S(c);N_GUARD,XP(I)::QAB1(C)
        • S(c);N_GUARD::QAB1(C)
        • S(c);N_GUARD::QAB1(C),XS(c)
      • Refutation
        • S(c);
    • Try
      • R(D);CHECK
      • Vars
        • K(d);N_SPINB(e),P-FLIGHT,XP(H)::QAR1(C)
      • Refutation
        • K(d);N_SPINB(e),S_FLIGHT
    • Try
      • R(G);CHECK,XB(e)
      • Vars
        • K(d);P-FLIGHT,XP(H)::QAR1(C)
        • S(c);XR(G)::QAB1(C)
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • R(D);P_PINS(c),P_SPINR(D),XP(a)
    • Threat
      • QAB1(C)
    • Vars
      • K(d);N_SPINB(e),N_SPINS(c),S_FLIGHT::S(F)
      • K(d);N_PINR(D),N_SPINB(e),N_SPINS(c),S_FLIGHT::R1(D),XS(c)
      • K(d);N_SPINB(e),OGATEB,P-FLIGHT,XP(H)::QAR1(C)
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).