MESON Chess Problem Database

Problem Display
PID: 139996 (3Q3b/1B1N4/2pn1p2/1PNk1P1R/1R1n1PK1/1p3p2/2pPp3/8 w - - 0 1)

Felkai, Imre

4th Comm., BCPS 034. Ty., 1938

3Q3b/1B1N4/2pn1p2/1PNk1P1R/1R1n1PK1/1p3p2/2pPp3/8

#2

11 + 10

56 The Problemist 1938

SOLUTION

  • SOUND
  • Sets
    • 1...S4xf5
      • 2.Bxc6#
    • 1...Se6
      • 2.Bxc6#
  • Tries
    • 1.Sxb3?
      • threat
        • 2.Rxd4#
      • 1...Ke4
        • 2.Rxd4#
      • 1...Sxb3
        • 2.Bxc6#
      • 1...S4xb5
        • 2.Sb6#
      • 1...S6xb5
        • 2.Sxf6#
      • 1...S6xf5
        • 2.Sdc5#
      • 1...Sc4
        • 2.Sxf6#
      • 1...Se6
        • 2.Sb6#
        • 2.Bxc6#
      • 1...S4xf5!
    • 1.Qg8+?
      • 1...Se6
        • 2.Bxc6#
        • 2.Qxe6#
      • 1...Sf7!
  • Keys
    • 1.Se6!
      • threat
        • 2.Rxd4#
      • 1...Ke4
        • 2.Rxd4#
      • 1...S4xb5
        • 2.Sb6#
      • 1...S4xf5
        • 2.Sc7#
      • 1...Sxe6
        • 2.Bxc6#
      • 1...S6xb5
        • 2.Sxf6#
      • 1...S6xf5
        • 2.Sdc5#
      • 1...Sc4
        • 2.Sxf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • S(e);N_GUARD,P_SPINS(e),XP(G)::B(I),XP(g)
    • S(e);N_GUARD::B(I),XP(g)
  • Tries
    • Try
      • S(F);XP(c)
      • Threat
        • R1(B),XS(e)
      • Vars
        • K(f);P_SPINS(e),S_FLIGHT::R1(B),XS(e)
        • S(e);N_GUARD,XS(F)::B(I),XP(g)
        • S(e);XP(E)::S(J)
        • S(h);XP(E)::QAR(K)+S(J),DCHECK,XP(i)
        • S(h);P_SPINS(h),XP(G)::QAR(K)+S(J)
        • S(h);::QAR(K)+S(J),DCHECK,XP(i)
      • Refutation
        • S(e);P_SPINS(e),XP(G)
    • Try
      • Q(K);CHECK
      • Refutation
        • S(h);P_SPINS(h)
  • Actual
    • S(F);
    • Threat
      • R1(B),XS(e)
    • Vars
      • K(f);P_SPINS(e),S_FLIGHT::R1(B),XS(e)
      • S(e);XP(E)::S(J)
      • S(e);P_SPINS(e),XP(G)::S(F)
      • S(e);N_GUARD,XS(F)::B(I),XP(g)
      • S(h);XP(E)::QAR(K)+S(J),DCHECK,XP(i)
      • S(h);P_SPINS(h),XP(G)::QAR(K)+S(J)
      • S(h);::QAR(K)+S(J),DCHECK,XP(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).