MESON Chess Problem Database

Problem Display
PID: 198727 (2R4r/4p2p/2n1B3/1rqP2QK/nPkN4/P3P3/1pP5/1N6 w - - 0 1)

Jakab, Arpad

1st Prize, 8. American Chess Congress, 1921

2R4r/4p2p/2n1B3/1rqP2QK/nPkN4/P3P3/1pP5/1N6

#2

11 + 9

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Sc3
      • 2.Sd2#
    • 1...Sa5
      • 2.d6#
    • 1...Se5
      • 2.d6#
    • 1...Sa7
      • 2.d6#
    • 1...Sb8
      • 2.d6#
  • Tries
    • 1.Qf4?
      • threat
        • 2.Qf1#
      • 1...Qxd5+
        • 2.Sf5#
      • 1...Qxb4
        • 2.Sb3#
      • 1...Qxd4
        • 2.Qxd4#
      • 1...Sxb4
        • 2.Se2#
        • 2.Sb3#
        • 2.Sf3#
        • 2.Sf5#
      • 1...Sxd4
        • 2.Qxd4#
      • 1...Sc3
        • 2.Sd2#
      • 1...Se5
        • 2.Se2#
        • 2.Sb3#
        • 2.Sf3#
        • 2.Sf5#
        • 2.d6#
      • 1...Rf8!
  • Keys
    • 1.Qg4!
      • threat
        • 2.Qe2#
      • 1...Qxd5+
        • 2.Sf5#
      • 1...Qxb4
        • 2.Sb3#
      • 1...Qxd4
        • 2.Qxd4#
      • 1...Sxb4
        • 2.Se2#
        • 2.Sb3#
        • 2.Sf3#
        • 2.Sf5#
      • 1...Sxd4
        • 2.Qxd4#
      • 1...Sc3
        • 2.Sd2#
      • 1...Se5
        • 2.d6#

This is a version of 65126

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • S(b);SBLOCK::S(A)
    • S(f);P_SPINQ(e)::B(J)+P(G)
  • Tries
    • Try
      • Q(H);P_SPINP(G)
      • Threat
        • QAB(H)
      • Vars
        • Q(e);CHECK,N_GUARD,P_SPINQ(e),P_SPINS(f),XP(G)::QAR(H)+S(F)
        • Q(e);N_GUARD,P_SPINS(f),XP(E)::QAR(H)+S(F)
        • Q(e);OGATE,P_SPINQ(e),P_SPINS(f),XS(F)::QAR1(H),XQ(e)
        • S(f);OGATE,P_SPINQ(e),P_SPINS(f),XS(F)::QAR1(H),XS(f)
        • S(b);SBLOCK::S(A)
      • Refutation
        • R(i);
  • Actual
    • Q(H);P_SPINP(G)
    • Threat
      • QAB(H)
    • Vars
      • Q(e);CHECK,N_GUARD,P_SPINQ(e),P_SPINS(f),XP(G)::QAR(H)+S(F)
      • Q(e);N_GUARD,P_SPINS(f),XP(E)::QAR(H)+S(F)
      • Q(e);OGATE,P_SPINQ(e),P_SPINS(f),XS(F)::QAR1(H),XQ(e)
      • S(f);OGATE,P_SPINQ(e),P_SPINS(f),XS(F)::QAR1(H),XS(f)
      • S(b);SBLOCK::S(A)
      • S(f);N_PINP(G),P_SPINQ(e)::B(J)+P(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).