MESON Chess Problem Database

Problem Display
PID: 140371 (1B4Q1/3K4/4N3/1N5P/R1p1k3/2R1npnb/B4br1/8 w - - 0 1)

Eddy, Edwin John

The Problemist, 1943

1B4Q1/3K4/4N3/1N5P/R1p1k3/2R1npnb/B4br1/8

#2

9 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Kf5
      • 2.Qg6#
    • 1...Bxe6+
      • 2.Qxe6#
    • 1...Sd5
      • 2.Bb1#
    • 1...Sef5
      • 2.Sg5#
    • 1...Sgf5
      • 2.Sc5#
  • Tries
    • 1.Sd6+?
      • 1...Kd5
        • 2.Ra5#
      • 1...Ke5!
    • 1.Raxc4+?
      • 1...Kd5
        • 2.Rd3#
        • 2.Rd4#
      • 1...Kf5
        • 2.Rf4#
        • 2.Qf7#
        • 2.Qg5#
        • 2.Qg6#
        • 2.Qf8#
      • 1...Sxc4!
  • Keys
    • 1.Ra5!
      • threat
        • 2.Sd6#
      • 1...Bxe6+
        • 2.Qxe6#
      • 1...Kd5
        • 2.Sd6#
      • 1...Kf5
        • 2.Qg6#
      • 1...Sd5
        • 2.Bb1#
      • 1...Sef5
        • 2.Sg5#
      • 1...Sgf5
        • 2.Sc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(h);N_PINS(F),N_SPINP(g),S_FLIGHT::QAB1(I)
    • B(f);CHECK,OGATE,XS(F)::QAR2(I),XB(f)
    • S(c);N_GUARD,SBLOCK::B(A)
    • S(c);N_PINS(F),SBLOCK::S(F)
    • S(e);N_PINS(F),SBLOCK::S(F)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • K(h);S_FLIGHT::R(C)
      • Refutation
        • K(h);N_SPINP(g),P-FLIGHT
    • Try
      • R(C);CHECK,XP(g)
      • Refutation
        • S(c);XR(C)
  • Actual
    • R(C);N_PINP(g)
    • Threat
      • S(D)
    • Vars
      • B(f);CHECK,OGATE,XS(F)::QAR2(I),XB(f)
      • K(h);P_SPINP(g),S_FLIGHT::R(C)+S(D)
      • K(h);N_PINS(F),S_FLIGHT::QAB1(I)
      • S(c);N_GUARD,SBLOCK::B(A)
      • S(c);N_PINS(F),SBLOCK::S(F)
      • S(e);N_PINS(F),SBLOCK::S(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).