MESON Chess Problem Database

Problem Display
PID: 214380 (3Q4/1N5b/3p4/1P1k4/3bR3/3Np3/2Kn4/8 w - - 0 1)

Gelbfuhs, Oscar

Washington Post, 1878

3Q4/1N5b/3p4/1P1k4/3bR3/3Np3/2Kn4/8

#2

6 + 6

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bxe4
      • 2.Qg8#
  • Tries
    • 1.Re5+?
      • 1...Kc4
        • 2.Sa5#
        • 2.Sxd6#
      • 1...Bxe5!
    • 1.Qxd6+?
      • 1...Kc4
        • 2.Qc5#
        • 2.Qc6#
      • 1...Kxe4!
    • 1.Qe8?
      • threat
        • 2.Qc6#
        • 2.Qe6#
      • 1...Kc4
        • 2.Qc6#
      • 1...Bxe4
        • 2.Qf7#
        • 2.Qg8#
      • 1...Sxe4
        • 2.Qf7#
      • 1...Bf5
        • 2.Qc6#
      • 1...Bg8
        • 2.Qc6#
      • 1...Be5!
  • Keys
    • 1.Qa8!
      • threat
        • 2.Sa5#
      • 1...Kc4
        • 2.Sxd6#
      • 1...Kxe4
        • 2.Sxd6#
      • 1...Bxe4
        • 2.Qg8#
      • 1...Sxe4
        • 2.Qa2#
      • 1...Be5
        • 2.Sbc5#
        • 2.Sd8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • B(f);N_GUARD,P_PINS(B),SBLOCK,XR(C)::QAB(F)
  • Tries
    • Try
      • R(C);CHECK,P_SPINS(B)
      • Refutation
        • B(c);XR(C)
    • Try
      • Q(F);CHECK,XP(e)
      • Refutation
        • K(d);S_FLIGHT,XR(C)
    • Try
      • Q(F);N_PINP(e)
      • Threat
        • DUALS(2)
      • Vars
        • K(d);P_SPINB(c),S_FLIGHT::QAR2(F)
        • S(a);SBLOCK,XR(C)::QAB(F)
        • B(f);::QAB1(F)
      • Refutation
        • B(c);
  • Actual
    • Q(F);N_PINP(e)
    • Threat
      • QAB(F)+S(E)
    • Vars
      • K(d);P_SPINB(c),S_FLIGHT::S(E),XP(e)
      • K(d);S_FLIGHT,XR(C)::QAB(F)+S(E),DCHECK,XP(e)
      • B(f);N_GUARD,P_PINS(B),SBLOCK,XR(C)::QAB(F)
      • S(a);N_GUARD,SBLOCK,XR(C)::QAB(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).