MESON Chess Problem Database

Problem Display
PID: 106111 (B7/rq5Q/b5R1/1p4b1/8/7p/6kP/1K2R1B1 w - - 0 1)

Brock, David Thurston

Checkmate, 1903

B7/rq5Q/b5R1/1p4b1/8/7p/6kP/1K2R1B1

#2

7 + 7

6490 yacpdb 2009
14868 Pirnie Collection 2013

SOLUTION

  • SOUND
  • Sets
    • 1...Qe4+
      • 2.Bxe4#
    • 1...Qd5
      • 2.Bxd5#
    • 1...Qc6
      • 2.Bxc6#
  • Tries
    • 1.Rxg5+?
      • 1...Kf3
        • 2.Qf5#
        • 2.Qf7#
      • 1...Kh1!
    • 1.Qxh3+?
      • 1...Kh1
        • 2.Bf2#
        • 2.Be3#
        • 2.Bd4#
        • 2.Bc5#
        • 2.Bb6#
        • 2.Bxa7#
      • 1...Kxh3!
  • Keys
    • 1.Rc6!
      • threat
        • 2.Qe4#
      • 1...Qxh7+
        • 2.Rc2#
      • 1...Kh1
        • 2.Qe4#
      • 1...Kf3
        • 2.Qe4#
      • 1...Qxc6
        • 2.Bxc6#
      • 1...Qe7
        • 2.Rc2#
      • 1...Qf7
        • 2.Rc2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • Q(g);CHECK,OGATE::B(G),XQ(g)
    • Q(g);OGATE::B(G),XQ(g)
  • Tries
    • Try
      • R(E);CHECK,XB(d)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(F);CHECK,XP(b)
      • Refutation
        • K(a);N_SPINB(d),N_SPINQ(g),S_FLIGHT,XQ(F)
  • Actual
    • R(E);N_PINB(d),N_PINQ(g)
    • Threat
      • QAB(F)
    • Vars
      • Q(g);CHECK,XQ(F)::B(G)+R(E),DCHECK
      • K(a);S_FLIGHT::QAB(F)
      • K(a);S_FLIGHT::QAB1(F)
      • Q(g);OGATE,P_SPINQ(g),XR(E)::B(G),XQ(g)
      • Q(g);::B(G)+R(E),DCHECK
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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).