MESON Chess Problem Database

Problem Display
PID: 172158 (RB4k1/3N1nP1/1P2n2P/K2B3p/6Nb/3Q4/b3rr1q/8 w - - 0 1)

Apro, Laszlo

Tidskrift for Schack, 1952

RB4k1/3N1nP1/1P2n2P/K2B3p/6Nb/3Q4/b3rr1q/8

#2

10 + 9

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Seg5
      • 2.Be5#
    • 1...Sf8
      • 2.gxf8Q#
      • 2.gxf8R#
  • Tries
    • 1.Be5+?
      • 1...Bd8
        • 2.h7#
      • 1...Sed8
        • 2.h7#
      • 1...Sf8
        • 2.Rxf8#
        • 2.h7#
        • 2.gxf8Q#
        • 2.gxf8R#
      • 1...Sfd8!
  • Keys
    • 1.Qg6!
      • threat
        • 2.h7#
      • 1...Sxg7
        • 2.Qxg7#
      • 1...Sxh6
        • 2.Sxh6#
      • 1...Seg5
        • 2.Be5#
      • 1...Sf8
        • 2.gxf8Q#
        • 2.gxf8R#
      • 1...Sfg5
        • 2.Bf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(g);N_GUARD,P_SPINS(h),S_CUTB(e)::R(I)+B(J)
    • S(g);OGATE,P_SPINS(h)::PXS(g)=Q
  • Tries
    • Try
      • B(J);CHECK
      • Vars
        • B(e);P_PINP(E),P_SPINB(e)::P(F)
        • S(g);P_SPINS(h)::P(F)
      • Refutation
        • S(h);P_SPINS(g)
  • Actual
    • Q(A);
    • Threat
      • P(F)
    • Vars
      • S(g);OGATE,P_SPINS(h),XP(H)::QAR1(A),XS(g)
      • S(h);P_SPINS(g),XP(F)::S(B),XS(h)
      • S(g);N_GUARD,P_SPINS(h),S_CUTB(e)::R(I)+B(J)
      • S(g);OGATE,P_SPINS(h)::PXS(g)=Q
      • S(h);N_GUARD,P_SPINS(g),S_CUTB(e)::R(I)+B(J)
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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).