MESON Chess Problem Database

Problem Display
PID: 2375 (B7/7K/1Q3p2/6p1/2N1ppk1/8/5P1R/8 w - - 0 1)

Greenshields, EB

Source?, 0000

B7/7K/1Q3p2/6p1/2N1ppk1/8/5P1R/8

#2

6 + 5

4774 Canadian Chess Problems 1890

SOLUTION

  • SOUND
  • Sets
    • 1...f5
      • 2.Se5#
  • Tries
    • 1.Bxe4?
      • 1...f5
        • 2.Se5#
      • 1...f3!
    • 1.Qd6?
      • 1...Kf3
        • 2.Qd1#
      • 1...Kf5
        • 2.Qd7#
      • 1...f3
        • 2.Se3#
      • 1...f5
        • 2.Se5#
      • 1...e3!
    • 1.Qe6+?
      • 1...f5
        • 2.Se5#
      • 1...Kf3!
  • Keys
    • 1.Qd4!
      • 1...Kf3
        • 2.Qd1#
      • 1...Kf5
        • 2.Qd7#
      • 1...e3
        • 2.Sxe3#
      • 1...f3
        • 2.Qxe4#
      • 1...f5
        • 2.Se5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • P(e);N_GUARD,SBLOCK::S(C)
  • Tries
    • Try
      • B(F);XP(a)
      • Vars
        • P(e);N_GUARD::S(C)
      • Refutation
        • P(b);
    • Try
      • Q(D);
      • Vars
        • K(c);P_SPINP(a),S_FLIGHT::QAB(D)
        • K(c);S_FLIGHT::QAB(D)
        • P(b);N_GUARD,SBLOCK::S(C)
        • P(e);N_GUARD,SBLOCK::S(C)
      • Refutation
        • P(a);
    • Try
      • Q(D);CHECK
      • Vars
        • P(e);P_SPINP(e)::S(C)
      • Refutation
        • K(c);P_SPINP(a),S_FLIGHT
  • Actual
    • Q(D);
    • Vars
      • K(c);P_SPINP(a),S_FLIGHT::QAB(D)
      • K(c);S_FLIGHT::QAB(D)
      • P(a);P_SPINP(b)::S(C),XP(a)
      • P(b);OGATEB,P_SPINP(a)::QAR2(D),XP(a)
      • P(e);N_GUARD,SBLOCK::S(C)
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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).