MESON Chess Problem Database

Problem Display
PID: 70984 (bB6/2r1QK2/1n1PB2p/R2qk3/2p4R/4p1P1/4Nb2/3r4 w - - 0 1)

Ellerman, Arnoldo

Swiat Szachowy, 1933

bB6/2r1QK2/1n1PB2p/R2qk3/2p4R/4p1P1/4Nb2/3r4

#2

9 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Rc5
      • 2.Qf6#
    • 1...Rc6
      • 2.Qf6#
    • 1...Rxe7+
      • 2.dxe7#
    • 1...Rc8
      • 2.Qf6#
  • Tries
    • 1.Bxd5+?
      • 1...Kf5
        • 2.Be4#
        • 2.Be6#
        • 2.Rf4#
        • 2.g4#
      • 1...Rxe7+!
    • 1.Bxc7?
      • threat
        • 2.Qf6#
        • 2.d7#
      • 1...Qxa5
        • 2.Qf6#
      • 1...Qb5
        • 2.Qf6#
      • 1...Qc5
        • 2.Qf6#
      • 1...Sc8
        • 2.Qf6#
      • 1...Sd7!
  • Keys
    • 1.Sc3!
      • threat
        • 2.Re4#
      • 1...Rxe7+
        • 2.dxe7#
      • 1...Qxa5
        • 2.Bd7#
      • 1...Qb5
        • 2.Bd7#
      • 1...Qc5
        • 2.Bd7#
      • 1...Rd4
        • 2.Rh5#
      • 1...Rc5
        • 2.Qf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • R(i);N_PINQ(G),N_SPINQ(e)::QAB1(G)
    • R(i);N_PINQ(G)::QAB1(G)
    • R(i);CHECK,OGATE,XQ(G)::B(I)+P(E),XR(i)
  • Tries
    • Try
      • B(F);CHECK,N_SPINB(F),XQ(e)
      • Refutation
        • R(i);CHECK,XQ(G)
    • Try
      • B(I);N_SPINQ(G),XR(i)
      • Threat
        • DUALS(2)
      • Vars
        • Q(e);N_PINB(F),N_SPINQ(e),XR(D)::QAB1(G)
        • Q(e);N_PINB(F)::QAB1(G)
        • S(g);::QAB1(G)
      • Refutation
        • S(g);
  • Actual
    • S(A);
    • Threat
      • R1(C)
    • Vars
      • R(i);CHECK,OGATE,XQ(G)::B(I)+P(E),XR(i)
      • Q(e);N_PINB(F),N_SPINQ(e),XR(D)::QAR(G)+B(F)
      • Q(e);N_PINB(F)::QAR(G)+B(F)
      • R(a);SBLOCK::R(C)
      • R(i);N_PINQ(G),N_SPINQ(e)::QAB1(G)
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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).