MESON Chess Problem Database

Problem Display
PID: 176433 (1b4N1/8/3B1pp1/6pb/1RN1QqkP/4pR1p/4B3/2K5 w - - 0 1)

Gab, Wolfgang

Schach-Echo, 1983

1b4N1/8/3B1pp1/6pb/1RN1QqkP/4pR1p/4B3/2K5

#2

9 + 9

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...gxh4
      • 2.Qxf4#
  • Tries
    • 1.Qe6+?
      • 1...Kxh4
        • 2.Rxh3#
        • 2.Qxh3#
      • 1...Qf5
        • 2.Sb2#
        • 2.Sd2#
        • 2.Sa3#
        • 2.Sxe3#
        • 2.Sa5#
        • 2.Se5#
        • 2.Sb6#
      • 1...f5!
  • Keys
    • 1.Qxe3!
      • threat
        • 2.Rxf4#
      • 1...Qxe3+
        • 2.Sxe3#
      • 1...Qxc4+
        • 2.Rxc4#
      • 1...Kxh4
        • 2.Rxh3#
      • 1...Kf5
        • 2.Sh6#
      • 1...Qxd6
        • 2.Se5#
        • 2.Sxd6#
        • 2.Rf4#
      • 1...Qxf3
        • 2.Qe4#
      • 1...gxh4
        • 2.Qxf4#
      • 1...Qh2
        • 2.Se5#
        • 2.Rf4#
      • 1...Qg3
        • 2.Se5#
        • 2.Rf4#
      • 1...Qe5
        • 2.Sxe5#
        • 2.Rf4#
      • 1...Qd4
        • 2.Rf4#
        • 2.Qxd4#
      • 1...Qe4
        • 2.Rf4#
        • 2.Qxe4#
      • 1...Qf5
        • 2.Se5#
        • 2.Rf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • P(e);N_GUARD,SBLOCK,XP(G)::QAR1(F),XQ(c)
  • Tries
    • Try
      • Q(F);CHECK,N_PINQ(c)
      • Refutation
        • P(g);P_SPINP(g)
  • Actual
    • Q(F);N_PINQ(c),P_SPINQ(F),XP(a)
    • Threat
      • B(B)+R(C),DCHECK,XQ(c)
    • Vars
      • Q(c);CHECK,XQ(F)::R(D)+S(E),DCHECK,XQ(c)
      • Q(c);CHECK,N_PINQ(F),OGATE,P_SPINQ(c),XS(E)::R(D),XQ(c)
      • K(d);P-FLIGHT,XP(G)::R1(C),XP(b)
      • K(d);P_SPINQ(c),S_FLIGHT::S(I)
      • Q(c);N_PINQ(F),P_SPINQ(c),XR(C)::QAR2(F)
      • P(e);N_GUARD,SBLOCK,XP(G)::QAR1(F),XQ(c)
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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).