MESON Chess Problem Database

Problem Display
PID: 132815 (1b3RB1/1QBnp3/K3Nrp1/2p1NkPb/2P2P2/4nrpP/8/4R3 w - - 0 1)

Boyer, Jean-Pierre

1st Prize, Revista de Sah, 1975

1b3RB1/1QBnp3/K3Nrp1/2p1NkPb/2P2P2/4nrpP/8/4R3

#2

12 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Sd1
      • 2.Qe4#
    • 1...Sf1
      • 2.Qe4#
    • 1...Sc2
      • 2.Qe4#
    • 1...Sg2
      • 2.Qe4#
    • 1...Sxc4
      • 2.Qe4#
    • 1...Sg4
      • 2.Qe4#
  • Tries
    • 1.Sxf3?
      • threat
        • 2.Sh4#
      • 1...Rf7
        • 2.Sg7#
      • 1...Sg2
        • 2.Qe4#
        • 2.Qb1#
      • 1...Bxf3!
    • 1.Sg4?
      • threat
        • 2.Sh6#
      • 1...Sxg4
        • 2.Qe4#
      • 1...Rf7
        • 2.Sg7#
      • 1...Bxg4!
    • 1.Sc6?
      • threat
        • 2.Sxe7#
      • 1...Ke4
        • 2.Qb1#
      • 1...Sd5
        • 2.Sg7#
      • 1...Rf7!
  • Keys
    • 1.Sf7!
      • threat
        • 2.Sh6#
      • 1...Rxe6+
        • 2.Sd6#
      • 1...Kxe6
        • 2.Qd5#
      • 1...Rxf7
        • 2.Sg7#
      • 1...Sg4
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • S(a);::QAB1(I)
    • S(a);XP(C)::QAB1(I)
  • Tries
    • Try
      • S(E);XR(b)
      • Threat
        • S(E)
      • Vars
        • R(g);N_PINS(H)::S(H)
      • Refutation
        • B(f);XS(E)
    • Try
      • S(E);
      • Threat
        • S(E)
      • Vars
        • S(a);XS(E)::QAB1(I)
        • R(g);N_PINS(H)::S(H)
      • Refutation
        • B(f);XS(E)
    • Try
      • S(E);N_SPINS(H)
      • Threat
        • S(E),XP(j)
      • Vars
        • K(e);N_SPINR(g),P_SPINS(a),S_FLIGHT::QAB(I)
        • S(a);::S(H)
      • Refutation
        • R(g);
  • Actual
    • S(E);N_PINR(g)
    • Threat
      • S(E)
    • Vars
      • R(g);CHECK,XS(H)::R(K)+S(E),DCHECK
      • K(e);P_SPINS(a),S_FLIGHT,XS(H)::QAB1(I)
      • R(g);N_PINS(H),P_SPINR(g),XS(E)::S(H)
      • S(a);::QAB1(I)
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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).