MESON Chess Problem Database

Problem Display
PID: 32690 (k2N4/n4R2/8/r7/8/2Q3B1/5bK1/8 w - - 0 1)

Thompson, Theophilus Augustus

Chess Problems by Theophilus A. Thompson, 1873

k2N4/n4R2/8/r7/8/2Q3B1/5bK1/8

#2

5 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Sb5
      • 2.Qf3#
      • 2.Qc6#
      • 2.Qc8#
    • 1...Sc6
      • 2.Qxc6#
    • 1...Sc8
      • 2.Qc6#
      • 2.Qxc8#
  • Tries
    • 1.Qf3+?
      • 1...Sc6
        • 2.Qxc6#
      • 1...Rd5!
    • 1.Qc7?
      • threat
        • 2.Qb8#
        • 2.Qb7#
      • 1...Bxg3
        • 2.Qb7#
      • 1...Re5
        • 2.Qb7#
      • 1...Sc6
        • 2.Qxc6#
        • 2.Qb7#
      • 1...Rb5!
  • Keys
    • 1.Rxa7+!
      • 1...Kxa7
        • 2.Qxa5#
      • 1...Rxa7
        • 2.Qc8#
      • 1...Bxa7
        • 2.Qc6#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • S(c);N_GUARD::QAB(B),XS(c)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • S(c);N_GUARD,P_SPINS(c)::QAB(B),XS(c)
      • Refutation
        • R(b);P_SPINR(b)
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);XB(C)::QAB1(B)
        • R(b);::QAB1(B)
      • Refutation
        • R(b);
  • Actual
    • R(D);CHECK,XS(c)
    • Vars
      • K(d);P-FLIGHT,XR(D)::QAR2(B),XR(b)
      • R(b);SBLOCK,XR(D)::QAR2(B)
      • B(a);SBLOCK,XR(D)::QAB(B)
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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).