MESON Chess Problem Database

Problem Display
PID: 78499 (2Bb1r2/3N1p2/4k1bR/1pB1p3/1Q2p1P1/r3P3/Pn1R4/1K6 w - - 0 1)

Langstaff, William A

3rd Prize, Source?, 1927

2Bb1r2/3N1p2/4k1bR/1pB1p3/1Q2p1P1/r3P3/Pn1R4/1K6

#2

10 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Bf6
      • 2.Sxf8#
  • Tries
    • 1.Sxe5+?
      • 1...Kxe5
        • 2.Qd4#
      • 1...Kf6!
    • 1.Qd4?
      • threat
        • 2.Qxe5#
        • 2.Qd5#
        • 2.Qd6#
      • 1...f5
        • 2.Qd5#
      • 1...f6
        • 2.Sxe5#
        • 2.Qd5#
      • 1...Rd3
        • 2.Qxe5#
      • 1...Ra6
        • 2.Qxe5#
        • 2.Qd5#
      • 1...Bf6
        • 2.Sxf8#
        • 2.Qd5#
        • 2.Qd6#
      • 1...Bc7
        • 2.Qd5#
      • 1...Be7
        • 2.Qxe5#
        • 2.Qd5#
      • 1...Sd3
        • 2.Qd6#
      • 1...Sc4
        • 2.Qd5#
      • 1...exd4!
  • Keys
    • 1.Qxe4!
      • threat
        • 2.Qf5#
      • 1...f5
        • 2.Qd5#
      • 1...f6
        • 2.Sxe5#
      • 1...Rd3
        • 2.Qxe5#
      • 1...Bf6
        • 2.Sxf8#
      • 1...Sd3
        • 2.Qc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • B(i);N_SPINB(g),SBLOCK::B(J)+S(I),DCHECK,XR(j)
  • Tries
    • Try
      • S(I);CHECK,XP(e)
      • Vars
        • K(f);N_SPINB(g),P-FLIGHT,XS(I)::QAB1(E)
      • Refutation
        • K(f);P-FLIGHT
    • Try
      • Q(E);
      • Threat
        • DUALS(3)
      • Vars
        • P(h);::QAB1(E)
        • R(b);::QAR1(E),XP(e)
        • B(i);::QAB1(E)
        • S(a);::QAR1(E)
        • S(a);::QAB1(E)
      • Refutation
        • P(e);XQ(E)
  • Actual
    • Q(E);P_PINP(e),P_SPINQ(E),XP(c)
    • Threat
      • QAB1(E)
    • Vars
      • P(h);N_PINQ(E)::QAB1(E)
      • P(h);N_SPINB(g),SBLOCK::B(J)+S(I),XP(e)
      • R(b);N_PINQ(E)::QAR1(E),XP(e)
      • B(i);N_SPINB(g),SBLOCK::B(J)+S(I),DCHECK,XR(j)
      • S(a);N_PINQ(E)::QAR2(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).