MESON Chess Problem Database

Problem Display
PID: 11510 (6Nk/5Q2/3p2p1/B7/5p2/K1R2q2/7n/1b6 w - - 0 1)

Lewis, CW

Chess, 1939

6Nk/5Q2/3p2p1/B7/5p2/K1R2q2/7n/1b6

#2

5 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qh1
      • 2.Rh3#
    • 1...Qe4
      • 2.Rh3#
    • 1...Qc6
      • 2.Rh3#
    • 1...Qb7
      • 2.Rh3#
    • 1...Qa8
      • 2.Rh3#
    • 1...Qxc3+
      • 2.Bxc3#
    • 1...Qh3
      • 2.Rxh3#
  • Tries
    • 1.Sf6?
      • threat
        • 2.Qg8#
        • 2.Qh7#
        • 2.Qf8#
      • 1...Qd5
        • 2.Rc8#
        • 2.Qh7#
      • 1...Qh5
        • 2.Rc8#
        • 2.Qg8#
        • 2.Qf8#
      • 1...Qb7
        • 2.Rh3#
        • 2.Qg8#
        • 2.Qf8#
      • 1...Qa8
        • 2.Rh3#
        • 2.Qh7#
      • 1...Qh3
        • 2.Rxh3#
        • 2.Qg8#
        • 2.Qf8#
      • 1...Ba2
        • 2.Qh7#
      • 1...g5
        • 2.Qg8#
        • 2.Qf8#
      • 1...Qxc3+!
  • Keys
    • 1.Se7!
      • threat
        • 2.Qg8#
      • 1...Qxc3+
        • 2.Bxc3#
      • 1...Qd5
        • 2.Rc8#
      • 1...Qa8
        • 2.Rh3#
      • 1...Ba2
        • 2.Sxg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • Q(c);N_PINR(B)::R(B)
    • Q(c);N_PINR(B),P_PINB(C),SBLOCK::R(B)
    • Q(c);CHECK,OGATE,XR(B)::B(C),XQ(c)
    • Q(c);::R(B),XQ(c)
  • Tries
    • Try
      • S(E);
      • Threat
        • DUALS(3)
      • Vars
        • B(a);::QAR1(D)
      • Refutation
        • Q(c);CHECK,XR(B)
  • Actual
    • S(E);
    • Threat
      • QAR1(D)
    • Vars
      • Q(c);CHECK,OGATE,XR(B)::B(C),XQ(c)
      • Q(c);N_PINR(B)::R(B)
      • Q(c);N_PINR(B),P_PINB(C),SBLOCK::R(B)
      • B(a);N_GUARD::S(E),XP(f)
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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).