MESON Chess Problem Database

Problem Display
PID: 63523 (KQ6/1nN4q/3k2pp/3rp3/Bp2PP2/2b5/1pRR1B2/2r5 w - - 0 1)

Stubbs, Arthur Goodwin

Chess Amateur (The), 1909

KQ6/1nN4q/3k2pp/3rp3/Bp2PP2/2b5/1pRR1B2/2r5

#2

9 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qe7
      • 2.Rxd5#
  • Tries
    • 1.Qd8+?
      • 1...Qd7
        • 2.Rxd5#
        • 2.Qxd7#
      • 1...Sxd8!
    • 1.Qf8+?
      • 1...Kxc7
        • 2.Qb8#
      • 1...Qe7!
  • Keys
    • 1.Qe8!
      • threat
        • 2.Sb5#
      • 1...Kxc7
        • 2.Qb8#
      • 1...Qxc7
        • 2.Rxd5#
      • 1...Bxd2
        • 2.Qe6#
      • 1...Rd4
        • 2.Qxe5#
      • 1...Qd7
        • 2.Qxd7#
      • 1...Qe7
        • 2.Qc6#
      • 1...Bd4
        • 2.Qe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • Q(k);SBLOCK::R1(B),XR(e)
  • Tries
    • Try
      • Q(I);CHECK
      • Refutation
        • S(j);XQ(I)
    • Try
      • Q(I);CHECK
      • Vars
        • K(g);N_SPINR(e),OGATEB,P_SPINB(c),S_FLIGHT,XS(G)::QAB1(I)
      • Refutation
        • Q(k);P_SPINQ(k)
  • Actual
    • Q(I);
    • Threat
      • S(G)
    • Vars
      • K(g);N_SPINR(e),OGATEB,P_SPINB(c),S_FLIGHT,XS(G)::QAB1(I)
      • Q(k);SBLOCK,XS(G)::R1(B),XR(e)
      • B(c);N_SPINR(e),XR(B)::QAR1(I)
      • R(e);S_CUTB(c)::QAB1(I),XP(f)
      • Q(k);N_GUARD::QAR1(I),XQ(k)
      • Q(k);SBLOCK::QAR1(I)
      • B(c);N_SPINR(e)::QAR1(I)
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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).