MESON Chess Problem Database

Problem Display
PID: 62010 (1Q1n4/8/2p1B3/1pkb3R/1p1N1r1r/1P2Np2/5B2/1K1R4 w - - 0 1)

Wielgos, Oskar

Deutsche Schachblatter, 1962

1Q1n4/8/2p1B3/1pkb3R/1p1N1r1r/1P2Np2/5B2/1K1R4

#2

9 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Sxe6
      • 2.Sxe6#
  • Tries
    • 1.Sc4?
      • threat
        • 2.Qd6#
        • 2.Qa7#
        • 2.Qb6#
      • 1...Rf7
        • 2.Qd6#
        • 2.Qb6#
      • 1...Sb7
        • 2.Qa7#
      • 1...Sf7
        • 2.Qa7#
        • 2.Qb6#
      • 1...bxc4!
    • 1.Sef5?
      • threat
        • 2.Qa7#
      • 1...Be4+
        • 2.Sc2#
      • 1...Bxe6
        • 2.Sxe6#
      • 1...Rxf5!
  • Keys
    • 1.Sdf5!
      • threat
        • 2.Qa7#
      • 1...Be4+
        • 2.Sc2#
      • 1...Rxf5
        • 2.Sg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • S(i);XB(H)::S(F),XS(i)
  • Tries
    • Try
      • S(E);
      • Threat
        • DUALS(3)
      • Vars
        • S(i);::QAB(I)
      • Refutation
        • P(e);XS(E)
    • Try
      • S(E);N_PINB(g)
      • Threat
        • QAB(I)
      • Vars
        • B(g);CHECK,S_CUTR(c)::B(C)+S(F)
        • B(g);XB(H)::B(C)+S(F),DCHECK,XB(g)
      • Refutation
        • R(c);XS(E)
  • Actual
    • S(F);N_PINB(g)
    • Threat
      • QAB(I)
    • Vars
      • B(g);CHECK,S_CUTR(c)::B(C)+S(E)
      • R(c);N_GUARD,XS(F)::B(C)+S(E)
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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).