MESON Chess Problem Database

Problem Display
PID: 2137 (1q2b3/6Q1/2R1B3/2n1p1p1/1p1k4/5P2/3K4/8 w - - 0 1)

Brown, Theodore Morris

Source?, 0000

1q2b3/6Q1/2R1B3/2n1p1p1/1p1k4/5P2/3K4/8

#2

5 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qd6
      • 2.Rxd6#
    • 1...Qa7
      • 2.Rd6#
    • 1...Qb5
      • 2.Rd6#
    • 1...Qc8
      • 2.Rd6#
    • 1...Sd3
      • 2.Rc4#
    • 1...Sa4
      • 2.Rc4#
    • 1...Sa6
      • 2.Rc4#
    • 1...Sb7
      • 2.Rc4#
    • 1...Sd7
      • 2.Rc4#
  • Tries
    • 1.Qd7+?
      • 1...Qd6
        • 2.Rxd6#
        • 2.Qxd6#
      • 1...Sxd7
        • 2.Rc4#
      • 1...Bxd7!
  • Keys
    • 1.Qa7!
      • threat
        • 2.Qxc5#
        • 2.Qa1#
      • 1...Qxa7
        • 2.Rd6#
      • 1...Bxc6
        • 2.Qa1#
      • 1...Qd6
        • 2.Rxd6#
        • 2.Qa1#
      • 1...Qb5
        • 2.Rd6#
        • 2.Qa1#
      • 1...Qb6
        • 2.Qa1#
      • 1...Qa8
        • 2.Qxc5#
      • 1...b3
        • 2.Qxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 8
  • Sets
    • Q(f);N_GUARD::R(C),XQ(f)
    • Q(f);N_GUARD::R(C)
    • S(c);OGATE::R1(C)
  • Tries
    • Try
      • Q(E);CHECK,N_PINP(d)
      • Vars
        • S(c);OGATE,XQ(E)::R1(C)
      • Refutation
        • B(g);XQ(E)
  • Actual
    • Q(E);N_PINP(d),P_PINS(c)
    • Threat
      • DUALS(2)
    • Vars
      • Q(f);N_GUARD,N_SPINS(c),XQ(E)::R(C)
      • B(g);XR(C)::QAB(E)
      • Q(f);N_SPINS(c)::QAB(E)
      • Q(f);::QAB1(E),XS(c)
      • P(a);::QAB1(E),XS(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).