MESON Chess Problem Database

Problem Display
PID: 202498 (1qnQ1n1r/p2p3R/N2k4/pP1b1PP1/1r3bK1/B3PN2/8/3R4 w - - 0 1)

Doney, J

Comm., Brisbane Courier, 1923

1qnQ1n1r/p2p3R/N2k4/pP1b1PP1/1r3bK1/B3PN2/8/3R4

#2

11 + 11

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qc7
      • 2.Qxc7#
    • 1...Qxb5
      • 2.Qc7#
    • 1...Qa8
      • 2.Qc7#
    • 1...Sb6
      • 2.Qe7#
      • 2.Qxb8#
    • 1...Se7
      • 2.Qxe7#
      • 2.Qxb8#
    • 1...Se6
      • 2.Rxd7#
      • 2.Qxd7#
    • 1...Sg6
      • 2.Rxd7#
      • 2.Qf6#
      • 2.Qxd7#
    • 1...a4
      • 2.Bxb4#
  • Tries
    • 1.Rh6+?
      • 1...Se6
        • 2.Rxe6#
      • 1...Sg6
        • 2.Rxg6#
        • 2.Qf6#
      • 1...Rxh6!
    • 1.Qxf8+?
      • 1...Se7
        • 2.Qxe7#
        • 2.Qf6#
      • 1...Rxf8!
  • Keys
    • 1.Sd2!
      • threat
        • 2.Sc4#
      • 1...Bf3+
        • 2.Sxf3#
      • 1...Ke5
        • 2.Qf6#
      • 1...Qxb5
        • 2.Qc7#
      • 1...Bc4
        • 2.Sxc4#
      • 1...Qc7
        • 2.Qxc7#
      • 1...Sb6
        • 2.Qe7#
        • 2.Qxb8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • Q(h);N_GUARD::QAB1(K),XQ(h)
    • Q(h);N_GUARD,XP(F)::QAB1(K)
    • Q(h);N_GUARD::QAB1(K)
    • P(c);N_GUARD::B(B),XR(a)
  • Tries
    • Try
      • R(J);CHECK
      • Vars
        • S(j);N_GUARD,P_SPINS(j)::R1(J),XS(j)
      • Refutation
        • R(k);XR(J)
    • Try
      • Q(K);CHECK,N_PINP(g),XS(j)
      • Refutation
        • R(k);XQ(K)
  • Actual
    • S(D);N_PINB(d)
    • Threat
      • S(D)
    • Vars
      • B(d);CHECK::R(A)+S(D),XB(d)
      • K(e);N_SPINP(g),N_SPINR(a),S_FLIGHT::QAB1(K)
      • Q(h);N_GUARD,XP(F)::QAB1(K)
      • B(d);::R(A)+S(D),DCHECK,XB(d)
      • Q(h);N_GUARD::QAB1(K),XQ(h)
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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).