MESON Chess Problem Database

Problem Display
PID: 87773 (4K3/p2p1p2/2pNk1nR/r3b1RN/P2P4/Q4B2/7q/8 w - - 0 1)

Schlegl, Gyorgy

The Problemist, 1930

4K3/p2p1p2/2pNk1nR/r3b1RN/P2P4/Q4B2/7q/8

#2

9 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...f6
      • 2.Sg7#
  • Tries
    • 1.Rgxg6+?
      • 1...Bf6
        • 2.Sg7#
        • 2.Rxf6#
      • 1...f6
        • 2.Sg7#
      • 1...fxg6!
    • 1.Rhxg6+?
      • 1...Bf6
        • 2.Sg7#
        • 2.Rxf6#
      • 1...f6
        • 2.Sg7#
      • 1...fxg6!
  • Keys
    • 1.Sb5!
      • threat
        • 2.Qe7#
      • 1...Bd6
        • 2.Qb3#
      • 1...Bf6
        • 2.Bg4#
      • 1...c5
        • 2.d5#
      • 1...d6
        • 2.Sc7#
      • 1...f6
        • 2.Sg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • P(i);N_SPINS(f),SBLOCK,S_CUTB(c)::S(F)
  • Tries
    • Try
      • R(E);CHECK,XS(f)
      • Vars
        • P(i);P_SPINP(i)::S(F)
      • Refutation
        • P(i);P_SPINP(i),XR(E)
    • Try
      • R(H);CHECK,XS(f)
      • Vars
        • P(i);P_SPINP(i)::S(F)
      • Refutation
        • P(i);XR(H)
  • Actual
    • S(G);
    • Threat
      • QAR1(A)
    • Vars
      • B(c);S_CUTP(h)::QAB(A)
      • B(c);N_SPINS(f),S_CUTP(i)::B(B)
      • P(d);N_GUARD::P(D)
      • P(h);S_CUTB(c)::S(G)
      • P(i);N_SPINS(f),SBLOCK,S_CUTB(c)::S(F)
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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).