MESON Chess Problem Database

Problem Display
PID: 197169 (2K2n1N/2P1k2p/Q6p/4PR2/B1pNn2q/b6r/3p4/4Rr1b w - - 0 1)

Eerkes, Allard Pieter

Haagsche Post, 1944

2K2n1N/2P1k2p/Q6p/4PR2/B1pNn2q/b6r/3p4/4Rr1b

#2

9 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Qf6
      • 2.exf6#
    • 1...Rxe1
      • 2.Rf7#
    • 1...Rg1
      • 2.Rf7#
    • 1...Rxf5
      • 2.Sxf5#
    • 1...Bf3
      • 2.Rf7#
    • 1...Bd6
      • 2.exd6#
    • 1...Sf2
      • 2.Rf7#
    • 1...Sc5
      • 2.Qd6#
    • 1...Sg5
      • 2.Qf6#
    • 1...Sd6+
      • 2.exd6#
    • 1...Sf6
      • 2.exf6#
    • 1...Se6
      • 2.Qxe6#
    • 1...Sg6
      • 2.Qe6#
    • 1...Sd7
      • 2.Qe6#
  • Tries
    • 1.Sg6+?
      • 1...Sxg6
        • 2.Qe6#
      • 1...hxg6!
    • 1.Qc6?
      • threat
        • 2.Qe8#
      • 1...Sd6+
        • 2.exd6#
      • 1...Sd7
        • 2.Qxd7#
        • 2.Qe6#
      • 1...Sf6
        • 2.exf6#
      • 1...Qh5!
  • Keys
    • 1.Bd7!
      • threat
        • 2.Sc6#
      • 1...Sd6+
        • 2.exd6#
      • 1...Sxd7
        • 2.Qe6#
      • 1...Qf6
        • 2.exf6#
      • 1...Sf2
        • 2.Rf7#
      • 1...Sc3
        • 2.Qxa3#
      • 1...Sg3
        • 2.Qxa3#
      • 1...Sc5
        • 2.Qd6#
      • 1...Sg5
        • 2.Qf6#
      • 1...Sf6
        • 2.exf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 7
  • Sets
    • Q(h);OGATE::P(D),XQ(h)
    • R(a);N_GUARD,XR(A)::R1(E)
    • R(a);N_GUARD::R1(E)
    • R(a);XR(E)::S(C),XR(a)
    • B(b);S_CUTR(a)::R1(E)
    • B(d);OGATE::P(D),XB(d)
    • S(g);S_CUTR(a)::R1(E)
    • S(g);N_GUARD,S_CUTB(d)::QAB1(F)
    • S(g);N_GUARD,S_CUTQ(h)::QAB1(F)
    • S(g);CHECK,OGATE::R(A)+P(D)DCHECK,XS(g)
    • S(g);OGATE::R(A)+P(D)DCHECK,XS(g)
    • S(l);N_GUARD::QAR1(F),XS(l)
    • S(l);N_GUARD::QAR1(F)
  • Tries
    • Try
      • S(I);CHECK
      • Vars
        • S(l);XS(I)::QAR1(F)
      • Refutation
        • P(k);XS(I)
    • Try
      • Q(F);
      • Threat
        • QAR1(F)
      • Vars
        • S(g);CHECK,OGATE::R(A)+P(D)DCHECK,XS(g)
        • S(g);OGATE::R(A)+P(D)DCHECK,XS(g)
      • Refutation
        • Q(h);
  • Actual
    • B(B);
    • Threat
      • S(C)
    • Vars
      • S(g);CHECK,OGATE::R(A)+P(D)DCHECK,XS(g)
      • S(l);N_GUARD,XB(B)::QAR1(F)
      • Q(h);OGATE::P(D),XQ(h)
      • S(g);S_CUTR(a)::R1(E)
      • S(g);N_GUARD,S_CUTR(e)::QAB(F),XB(d)
      • S(g);N_GUARD,S_CUTB(d)::QAB1(F)
      • S(g);N_GUARD,S_CUTQ(h)::QAB1(F)
      • S(g);OGATE::R(A)+P(D)DCHECK,XS(g)
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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).