MESON Chess Problem Database

Problem Display
PID: 31470 (8/8/8/4p3/5ppB/KQ4r1/4Pkrp/R4Bbn w - - 0 1)

Easter, Norris

The Problemist, 1927

8/8/8/4p3/5ppB/KQ4r1/4Pkrp/R4Bbn

#2

6 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...f3
      • 2.Qb6#
  • Tries
    • 1.Bxg3+?
      • 1...Sxg3
        • 2.Qb6#
      • 1...fxg3
        • 2.Qb6#
      • 1...Rxg3!
    • 1.Rb1?
      • 1...f3
        • 2.Qb6#
      • 1...e4!
    • 1.Rc1?
      • 1...f3
        • 2.Qb6#
      • 1...e4!
    • 1.Rd1?
      • 1...f3
        • 2.Qb6#
      • 1...e4!
    • 1.Qc3?
      • 1...f3
        • 2.Qc5#
      • 1...e4!
  • Keys
    • 1.e4!
      • 1...fxe4 ep
        • 2.Qf7#
      • 1...f3
        • 2.Qb6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • P(g);N_PINQ(E)::QAB(E)
  • Tries
    • Try
      • B(F);CHECK,N_SPINQ(E),XR(f)
      • Vars
        • S(b);SBLOCK,XB(F)::QAB(E)
        • P(g);SBLOCK,XB(F)::QAB(E)
      • Refutation
        • R(d);P_PINQ(E),XB(F)
    • Try
      • R(A);
      • Vars
        • P(g);N_PINQ(E)::QAB(E)
      • Refutation
        • P(i);
    • Try
      • R(A);
      • Vars
        • P(g);N_PINQ(E)::QAB(E)
      • Refutation
        • P(i);
    • Try
      • R(A);
      • Vars
        • P(g);N_PINQ(E)::QAB(E)
      • Refutation
        • P(i);
    • Try
      • Q(E);
      • Vars
        • P(g);N_PINQ(E)::QAB(E)
      • Refutation
        • P(i);
  • Actual
    • P(C);
    • Vars
      • P(g);EP,N_PINQ(E),XP(C)::QAR(E)
      • P(g);N_PINQ(E),SBLOCK::QAB(E)
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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).