MESON Chess Problem Database

Problem Display
PID: 101058 (q1b5/5N2/p2PPb1n/3k1p2/P2P4/PR4N1/4Q3/B6K w - - 0 1)

Letzen, Einar

Good Companions, 1920

q1b5/5N2/p2PPb1n/3k1p2/P2P4/PR4N1/4Q3/B6K

#2

11 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kc6
      • 2.Qf3#
      • 2.Qc4#
      • 2.Qg2#
  • Tries
    • 1.Rb5+?
      • 1...Kc6
        • 2.Qf3#
        • 2.Qc4#
        • 2.Qc2#
        • 2.Qg2#
        • 2.d5#
      • 1...axb5!
    • 1.Qf3+?
      • 1...Kc4
        • 2.Rb4#
      • 1...Kxe6!
    • 1.Qe4+?
      • 1...Kc4
        • 2.Rc3#
        • 2.Rb4#
      • 1...fxe4!
  • Keys
    • 1.Qa2!
      • threat
        • 2.Rb6#
      • 1...Kc4+
        • 2.Rf3#
      • 1...Kxe6+
        • 2.Rb7#
      • 1...Kc6
        • 2.Qg2#
      • 1...Bxd4
        • 2.Rc3#
      • 1...Qc6
        • 2.Rb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(E);CHECK
      • Refutation
        • P(c);XR(E)
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);P_PINQ(C),S_FLIGHT::R1(E)
      • Refutation
        • K(a);P_PINQ(C),S_FLIGHT,XP(J)
    • Try
      • Q(C);CHECK
      • Refutation
        • P(b);XQ(C)
  • Actual
    • Q(C);
    • Threat
      • QAB(C)+R(E)
    • Vars
      • K(a);CHECK,S_FLIGHT::QAB(C)+R(E)
      • K(a);CHECK,S_FLIGHT,XP(J)::QAB(C)+R(E)
      • K(a);S_FLIGHT::QAB(C)
      • B(d);SBLOCK,XP(H)::QAB(C)+R(E)
      • Q(f);SBLOCK::QAB(C)+R(E),DCHECK
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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).