MESON Chess Problem Database

Problem Display
PID: 140071 (1b1B3N/1KpR3p/1Q5p/1R2P2k/4N3/4rq1P/4B1n1/3b4 w - - 0 1)

Reilly, William Henry

The Problemist, 1938

1b1B3N/1KpR3p/1Q5p/1R2P2k/4N3/4rq1P/4B1n1/3b4

#2

10 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qg4
      • 2.hxg4#
    • 1...c6
      • 2.Sg3#
  • Tries
    • 1.Rxh7?
      • threat
        • 2.Rxh6#
        • 2.Qg6#
        • 2.Qxh6#
      • 1...Sf4
        • 2.Rxh6#
        • 2.Qxh6#
      • 1...Sh4
        • 2.Rxh6#
        • 2.Qxh6#
      • 1...c6
        • 2.Sg3#
      • 1...cxb6!
    • 1.Qf6?
      • threat
        • 2.Qf5#
        • 2.Qf7#
      • 1...Rxe2
        • 2.Qxf3#
      • 1...Bb3
        • 2.Qf5#
      • 1...Sf4
        • 2.Qh4#
        • 2.Qf5#
      • 1...Sh4
        • 2.Qxh4#
      • 1...Bxe2!
  • Keys
    • 1.Rd6!
      • threat
        • 2.Rxh6#
      • 1...cxb6
        • 2.e6#
      • 1...cxd6
        • 2.exd6#
      • 1...c6
        • 2.Sg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • Q(d);N_PINS(C),OGATE::P(B),XQ(d)
    • P(g);N_PINS(C)::S(C)
  • Tries
    • Try
      • R(H);P_PINP(f),XP(h)
      • Threat
        • DUALS(3)
      • Vars
        • P(g);N_PINS(C)::S(C)
      • Refutation
        • P(g);XQ(F)
    • Try
      • Q(F);
      • Threat
        • DUALS(2)
      • Vars
        • R(c);N_GUARD,N_SPINQ(d),XB(A)::QAB(F),XQ(d)
        • B(a);::QAR2(F)
        • S(b);N_GUARD::QAR1(F),XS(b)
      • Refutation
        • B(a);N_SPINQ(d),XB(A)
  • Actual
    • R(H);
    • Threat
      • R1(H),XP(f)
    • Vars
      • P(g);N_GUARD,XQ(F)::R(D)+P(E)
      • P(g);OGATE,XR(H)::R(D)+P(E),XP(g)
      • P(g);N_PINS(C)::S(C)
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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).