MESON Chess Problem Database

Problem Display
PID: 229207 (1BB1n3/pP1p4/krbR4/p2N4/npP1N3/1K6/8/6Q1 w - - 0 1)

Ferenczi, Istvan

Nepszava, 1926

1BB1n3/pP1p4/krbR4/p2N4/npP1N3/1K6/8/6Q1

#2

9 + 9

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rb5
      • 2.Qxa7#
    • 1...Rxb7
      • 2.Qxa7#
    • 1...Sb2
      • 2.Sc5#
    • 1...Sc3
      • 2.Sc5#
    • 1...Sc5+
      • 2.Sxc5#
    • 1...Sxd6
      • 2.Sc7#
    • 1...Sf6
      • 2.Sc7#
    • 1...Sc7
      • 2.Sxc7#
    • 1...Sg7
      • 2.Sc7#
  • Tries
    • 1.Qxb6+?
      • 1...Sxb6
        • 2.Sc5#
      • 1...axb6!
  • Keys
    • 1.Qf1!
      • 1...Sc5+
        • 2.Sxc5#
      • 1...Rxb7
        • 2.c5#
      • 1...Bxd5
        • 2.cxd5#
      • 1...Bxb7
        • 2.c5#
      • 1...Sxd6
        • 2.Sc7#
      • 1...Rb5
        • 2.cxb5#
      • 1...Bb5
        • 2.cxb5#
      • 1...Sb2
        • 2.Sc5#
      • 1...Sc3
        • 2.Sc5#
      • 1...Sf6
        • 2.Sc7#
      • 1...Sc7
        • 2.Sxc7#
      • 1...Sg7
        • 2.Sc7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(e);OGATE,P_SPINB(f)::QAR1(A),XP(g)
    • R(e);OGATE,P_SPINB(f),P_SPINR(e),XP(G)::QAR1(A),XP(g)
    • S(a);N_GUARD::S(D)
    • S(a);CHECK,N_GUARD::S(D),XS(a)
    • S(i);N_GUARD,XR(F)::S(E)
    • S(i);N_GUARD::S(E)
    • S(i);N_GUARD::S(E),XS(i)
  • Tries
    • Try
      • Q(A);CHECK,XR(e)
      • Vars
        • S(a);XQ(A)::S(D)
      • Refutation
        • P(g);XQ(A)
  • Actual
    • Q(A);
    • Vars
      • S(a);CHECK,N_GUARD::S(D),XS(a)
      • R(e);N_GUARD,P_SPINB(f),P_SPINR(e),XP(G)::QAB(A)+P(C)
      • B(f);OGATE,P_PINP(C),P_SPINR(e),XS(E)::QAB(A)+P(C),XB(f)
      • B(f);N_GUARD,P_SPINB(f),P_SPINR(e),XP(G)::QAB(A)+P(C)
      • S(i);N_GUARD,XR(F)::S(E)
      • R(e);OGATE,P_SPINB(f)::P(C),XR(e)
      • B(f);OGATE,P_SPINR(e)::P(C),XB(f)
      • S(a);N_GUARD::S(D)
      • S(i);N_GUARD::S(E)
      • S(i);N_GUARD::S(E),XS(i)
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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).