MESON Chess Problem Database

Problem Display
PID: 67785 (4K3/3p3B/N4B2/3PQp1r/P1k2qR1/4b1Rr/2P3b1/8 w - - 0 1)

Gockel, Hubert

1st Prize, White MT, 1980-1981

4K3/3p3B/N4B2/3PQp1r/P1k2qR1/4b1Rr/2P3b1/8

#2

10 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Bxd5
      • 2.Qc3#
    • 1...fxg4
      • 2.Bd3#
  • Tries
    • 1.Rxf4+?
      • 1...Bd4
        • 2.Rxd4#
        • 2.Qxd4#
      • 1...Bxf4
        • 2.Qd4#
      • 1...Be4!
    • 1.Qc7+?
      • 1...Bc5
        • 2.Qxc5#
      • 1...Kxd5!
    • 1.d6?
      • threat
        • 2.Qb5#
      • 1...fxg4
        • 2.Bd3#
      • 1...Qd4
        • 2.Qc5#
      • 1...Qe4
        • 2.Bg8#
      • 1...Bd5
        • 2.Qc3#
      • 1...Bc5
        • 2.Qxc5#
      • 1...Bc6!
  • Keys
    • 1.Bg8!
      • threat
        • 2.Qc3#
      • 1...Qd4
        • 2.Qc7#
      • 1...Qe4
        • 2.d6#
      • 1...Bd2
        • 2.Qc7#
        • 2.Qe2#
      • 1...Bd4
        • 2.Qe2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • B(a);SBLOCK,XP(E)::QAR1(F)
    • P(f);N_SPINQ(e),OGATE,XR(D)::B(I)
  • Tries
    • Try
      • R(D);CHECK,XQ(e)
      • Vars
        • B(b);N_GUARD,XR(D)::QAR1(F)
      • Refutation
        • B(a);P_SPINB(a)
    • Try
      • Q(F);CHECK
      • Vars
        • B(b);N_GUARD,P_SPINB(b)::QAR1(F),XB(b)
      • Refutation
        • K(d);N_SPINQ(e),S_FLIGHT,XP(E)
    • Try
      • P(E);
      • Threat
        • QAB1(F)
      • Vars
        • P(f);N_SPINQ(e),OGATE,XR(D)::B(I)
        • Q(e);S_CUTB(b)::QAR1(F)
        • Q(e);P_PINQ(F),S_CUTB(a)::B(I)
        • B(a);SBLOCK::QAR1(F)
        • B(b);N_GUARD::QAR1(F),XB(b)
      • Refutation
        • B(a);
  • Actual
    • B(I);
    • Threat
      • QAR1(F)
    • Vars
      • Q(e);S_CUTB(b)::QAR(F)
      • Q(e);P_PINQ(F),S_CUTB(a)::B(I)+P(E)
      • B(b);N_SPINQ(e),OGATE::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).