MESON Chess Problem Database

Problem Display
PID: 172069 (3N4/3RB3/pPp3p1/Q1nbkrnR/pK4P1/1p1pPpP1/3N4/8 w - - 0 1)

Apro, Laszlo

Magyar Sakkvilag, 1935

3N4/3RB3/pPp3p1/Q1nbkrnR/pK4P1/1p1pPpP1/3N4/8

#2

11 + 12

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rf4+
      • 2.gxf4#
    • 1...Be4
      • 2.Sc4#
    • 1...Be6
      • 2.Sxc6#
    • 1...Sce4
      • 2.Sc4#
    • 1...Sce6
      • 2.Sxc6#
    • 1...Sge4
      • 2.Sxf3#
    • 1...Sge6
      • 2.Sf7#
  • Tries
    • 1.Rxd5+?
      • 1...Kxd5
        • 2.Qxc5#
      • 1...cxd5!
    • 1.Qxc5?
      • threat
        • 2.Qd4#
        • 2.Qd6#
        • 2.Qc3#
      • 1...Rf4+
        • 2.exf4#
        • 2.gxf4#
      • 1...Rf6
        • 2.Qd4#
        • 2.Qc3#
      • 1...Se4
        • 2.Sxf3#
        • 2.Sc4#
        • 2.Qd4#
      • 1...Se6
        • 2.Sxc6#
        • 2.Sf7#
        • 2.Qd6#
      • 1...Sf7
        • 2.Qd4#
        • 2.Qc3#
      • 1...a5+!
  • Keys
    • 1.Ka3!
      • threat
        • 2.Qc3#
      • 1...Rf4
        • 2.gxf4#
      • 1...Sce4
        • 2.Sc4#
      • 1...Sce6
        • 2.Sxc6#
      • 1...Sge4
        • 2.Sxf3#
      • 1...Sge6
        • 2.Sf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 2
  • Sets
    • R(h);CHECK,OGATE,P_SPINS(i)::P(C),XR(h)
    • B(f);N_GUARD,P_SPINS(e),SBLOCK::S(A)
    • B(f);N_GUARD,P_SPINS(e),SBLOCK::S(K),XP(k)
    • S(e);P_SPINB(f),SBLOCK::S(A)
    • S(e);P_SPINB(f),SBLOCK::S(K),XP(k)
    • S(i);N_GUARD,P_SPINR(h),SBLOCK,S_CUTB(f)::S(A),XP(c)
    • S(i);N_GUARD,P_SPINR(h),SBLOCK,S_CUTB(f)::S(K)
  • Tries
    • Try
      • R(I);CHECK,XB(f)
      • Vars
        • K(g);P-FLIGHT,P_SPINS(e),XR(I)::QAR1(F),XS(e)
      • Refutation
        • P(k);XR(I)
    • Try
      • Q(F);P_PINB(f),XS(e)
      • Threat
        • DUALS(3)
      • Refutation
        • P(j);CHECK
  • Actual
    • K(D);S_FLIGHT
    • Threat
      • QAB(F)
    • Vars
      • R(h);OGATE,P_SPINS(i)::P(C),XR(h)
      • S(e);P_SPINB(f),SBLOCK::S(A)
      • S(e);P_SPINB(f),SBLOCK::S(K),XP(k)
      • S(i);N_GUARD,P_SPINR(h),SBLOCK,S_CUTB(f)::S(A),XP(c)
      • S(i);N_GUARD,P_SPINR(h),SBLOCK,S_CUTB(f)::S(K)
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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).