MESON Chess Problem Database

Problem Display
PID: 57921 (4N3/3pp3/1B6/1P1k1p1N/2pPq3/K1R4n/6Q1/8 w - - 0 1)

Laws, Benjamin Glover

British Chess Magazine, 1883

4N3/3pp3/1B6/1P1k1p1N/2pPq3/K1R4n/6Q1/8

#2

8 + 7

3713 Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Ke6
      • 2.Qg8#
    • 1...Sg1
      • 2.Sf4#
    • 1...Sf2
      • 2.Sf4#
    • 1...Sf4
      • 2.Sxf4#
    • 1...Sg5
      • 2.Sf4#
    • 1...d6
      • 2.Sc7#
    • 1...e5
      • 2.Qg8#
    • 1...e6
      • 2.Shf6#
  • Tries
    • 1.Shf6+?
      • 1...Ke6
        • 2.Qg8#
      • 1...exf6!
    • 1.Qg8+?
      • 1...e6
        • 2.Shf6#
      • 1...Qe6!
  • Keys
    • 1.Re3!
      • 1...Ke6
        • 2.Qg8#
      • 1...Qxg2
        • 2.Re5#
      • 1...c3
        • 2.Qa2#
      • 1...Qf3
        • 2.Qxf3#
      • 1...Sg1
        • 2.Sf4#
      • 1...Sf2
        • 2.Sf4#
      • 1...Sf4
        • 2.Sxf4#
      • 1...Sg5
        • 2.Sf4#
      • 1...f4
        • 2.Qxe4#
      • 1...d6
        • 2.Sc7#
      • 1...e5
        • 2.Qg8#
      • 1...e6
        • 2.Shf6#

This anticipates 266421(1937)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(d);N_SPINQ(c),S_FLIGHT::QAB(A)
    • S(a);N_GUARD::S(F)
    • S(a);N_GUARD::S(F),XS(a)
    • P(f);SBLOCK::S(H)
    • P(g);N_GUARD::QAB(A)
    • P(g);N_GUARD,SBLOCK::S(F)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(d);N_SPINQ(c),S_FLIGHT::QAB(A)
      • Refutation
        • P(g);XS(F)
    • Try
      • Q(A);CHECK,N_PINQ(c)
      • Vars
        • P(g);P_SPINP(g)::S(F)
      • Refutation
        • Q(c);P_SPINQ(c)
  • Actual
    • R(C);
    • Vars
      • K(d);S_FLIGHT::QAB(A)
      • Q(c);N_SPINQ(c),OGATE,XQ(A)::R1(C)
      • P(b);OGATEB::QAB(A)
      • Q(c);OGATEB,P_PINR(C)::QAB(A),XQ(c)
      • S(a);N_GUARD::S(F)
      • S(a);N_GUARD::S(F),XS(a)
      • P(e);N_GUARD::QAB1(A),XQ(c)
      • P(f);SBLOCK::S(H)
      • P(g);N_GUARD::QAB(A)
      • P(g);N_GUARD,SBLOCK::S(F)
HTML5 logo

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).