MESON Chess Problem Database

Problem Display
PID: 120730 (1B4b1/2NQ4/1q3P2/1P2k3/1PB2p2/2p1pP1N/8/7K w - - 0 1)

Sim, Malcolm

La Presse, 1922

1B4b1/2NQ4/1q3P2/1P2k3/1PB2p2/2p1pP1N/8/7K

#2

10 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qd4
      • 2.Sd5#
  • Tries
    • 1.Qf5+?
      • 1...Kd4
        • 2.Qe4#
        • 2.Qxf4#
      • 1...Kd6
        • 2.Se8#
      • 1...Kxf5!
    • 1.Qd5+?
      • 1...Kxf6
        • 2.Qg5#
      • 1...Bxd5!
  • Keys
    • 1.Qg4!
      • threat
        • 2.Qxf4#
      • 1...Kd4
        • 2.Qxf4#
      • 1...Kd6
        • 2.Se8#
      • 1...Kxf6
        • 2.Qg5#
      • 1...Qxf6
        • 2.Se6#
      • 1...Qd4
        • 2.Sd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • Q(e);N_GUARD,SBLOCK::B(J)+S(H)
  • Tries
    • Try
      • Q(I);CHECK
      • Vars
        • K(d);S_FLIGHT::B(J)+S(H),DCHECK
      • Refutation
        • K(d);P-FLIGHT,XQ(I)
    • Try
      • Q(I);CHECK
      • Vars
        • K(d);OGATE,S_FLIGHT,XP(G)::QAB1(I)
      • Refutation
        • B(f);P_PINP(B),XQ(I)
  • Actual
    • Q(I);
    • Threat
      • QAB1(I),XP(c)
    • Vars
      • K(d);P_SPINP(c),S_FLIGHT::QAR2(I),XP(c)
      • K(d);S_FLIGHT::B(J)+S(H),DCHECK
      • K(d);S_FLIGHT,XP(G)::QAB1(I)
      • Q(e);N_GUARD,SBLOCK,XP(G)::B(J)+S(H)
      • Q(e);N_GUARD,SBLOCK::B(J)+S(H)
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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).