MESON Chess Problem Database

Problem Display
PID: 226355 (4b2K/p4p2/p6R/Nkp1Qr2/p3N3/p2P4/1q1B4/bR1n4 w - - 0 1)

Langstaff, William A

British Chess Magazine, 1931

4b2K/p4p2/p6R/Nkp1Qr2/p3N3/p2P4/1q1B4/bR1n4

#2

8 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Rf6
      • 2.Qxc5#
    • 1...f6
      • 2.Qb8#
  • Tries
    • 1.Rxb2+?
      • 1...Sxb2
        • 2.Qb8#
        • 2.Qxe8#
      • 1...axb2
        • 2.Qb8#
        • 2.Qxe8#
      • 1...Bxb2!
    • 1.Rb6+?
      • 1...axb6
        • 2.Sd6#
      • 1...Kxb6!
  • Keys
    • 1.Sc4!
      • threat
        • 2.Sxa3#
      • 1...Rf6
        • 2.Qxc5#
      • 1...Sc3
        • 2.Qb8#
      • 1...f6
        • 2.Qxe8#
      • 1...Qb4
        • 2.Rxb4#
      • 1...Bc6
        • 2.Sed6#
      • 1...a2
        • 2.Sa3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(h);N_PINQ(F)::QAR1(F),XP(g)
    • P(k);N_PINQ(F)::QAR(F)
  • Tries
    • Try
      • R(A);CHECK,N_SPINQ(F),XQ(c)
      • Refutation
        • B(a);P_PINQ(F),XR(A)
    • Try
      • R(G);CHECK
      • Vars
        • P(j);SBLOCK,XR(G)::S(D)
      • Refutation
        • K(f);N_SPINP(g),P-FLIGHT,XR(G)
  • Actual
    • S(E);
    • Threat
      • S(E),XP(d)
    • Vars
      • R(h);N_PINQ(F)::QAR1(F),XP(g)
      • S(b);N_PINQ(F)::QAR(F)
      • P(k);N_PINQ(F)::QAB(F),XB(l)
      • Q(c);OGATE::R1(A),XQ(c)
      • B(l);SBLOCK::S(D)
      • P(d);::S(E)
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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).