MESON Chess Problem Database

Problem Display
PID: 100857 (n7/K1p2B2/2P5/1NQ1PkN1/3p3P/2P1q1BP/4P3/8 w - - 0 1)

Bettmann, Henry Wald

Good Companions, 1919

n7/K1p2B2/2P5/1NQ1PkN1/3p3P/2P1q1BP/4P3/8

#2

12 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qc1
      • 2.Sxd4#
    • 1...Qxe2
      • 2.Sxd4#
    • 1...Qf3
      • 2.Sxd4#
    • 1...Qxe5
      • 2.Qxe5#
  • Tries
    • 1.e6+?
      • 1...Qe5
        • 2.Qxe5#
      • 1...Kf6!
  • Keys
    • 1.Qxd4!
      • 1...Qxd4+
        • 2.Sxd4#
      • 1...Qxg5
        • 2.Qd3#
        • 2.e4#
      • 1...Qxe2
        • 2.Qf4#
        • 2.Qd7#
      • 1...Qxc3
        • 2.Qe4#
        • 2.Qf4#
        • 2.Qg4#
        • 2.Qd7#
        • 2.e4#
      • 1...Qxg3
        • 2.Qe4#
      • 1...Qxe5
        • 2.Qxe5#
      • 1...Qc1
        • 2.Qd3#
        • 2.Qe4#
        • 2.Qg4#
        • 2.Qd7#
        • 2.e4#
      • 1...Qg1
        • 2.e4#
      • 1...Qd2
        • 2.Qe4#
        • 2.Qg4#
        • 2.e4#
      • 1...Qf2
        • 2.Qxf2#
        • 2.e4#
      • 1...Qf4
        • 2.Qxf4#
      • 1...Qd3
        • 2.Qxd3#
        • 2.Qf4#
        • 2.Qg4#
      • 1...Qf3
        • 2.Qd7#
      • 1...Qe4
        • 2.Qxe4#
        • 2.Qd7#
      • 1...Sb6
        • 2.Qg4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • Q(a);N_GUARD::S(F),XP(b)
    • Q(a);N_GUARD,XP(A)::S(F),XP(b)
    • Q(a);OGATE,P_SPINQ(a),XP(H)::QAR1(G),XQ(a)
  • Tries
    • Try
      • P(H);CHECK
      • Vars
        • Q(a);N_GUARD,P_SPINQ(a)::QAR1(G),XQ(a)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • Q(G);P_SPINQ(G),XP(b)
    • Vars
      • Q(a);CHECK,XQ(G)::S(F),XQ(a)
      • Q(a);N_PINQ(G),XB(C)::QAB1(G)
      • Q(a);N_PINQ(G),XP(H)::QAR1(G),XQ(a)
      • Q(a);OGATE::P(A)
      • Q(a);N_PINQ(G)::QAR1(G),XQ(a)
      • Q(a);N_PINQ(G)::QAB(G)
      • S(e);N_PINQ(G)::QAB1(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).