MESON Chess Problem Database

Problem Display
PID: 152047 (8/1pr5/8/8/4B2R/B1p1k3/p2pN2R/2Qb3K w - - 0 1)

McAllister, George W

Good Companions (February), 1915

8/1pr5/8/8/4B2R/B1p1k3/p2pN2R/2Qb3K

#2

7 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Rc5
      • 2.Bxc5#
    • 1...Re7
      • 2.Bc5#
      • 2.Qxc3#
    • 1...Rf7
      • 2.Bc5#
      • 2.Qxc3#
    • 1...Rg7
      • 2.Bc5#
      • 2.Qxc3#
    • 1...Rh7
      • 2.Bc5#
      • 2.Qxc3#
    • 1...Bc2
      • 2.Qg1#
    • 1...Bxe2
      • 2.Qg1#
    • 1...Bb3
      • 2.Qg1#
    • 1...Ba4
      • 2.Qg1#
    • 1...dxc1Q
      • 2.Bxc1#
    • 1...dxc1S
      • 2.Bxc1#
    • 1...dxc1B
      • 2.Bxc1#
    • 1...dxc1R
      • 2.Bxc1#
  • Tries
    • 1.Bf8?
      • threat
        • 2.Bh6#
      • 1...Bxe2
        • 2.Qg1#
      • 1...Rc5
        • 2.Bxc5#
      • 1...Rf7
        • 2.Bc5#
        • 2.Qxc3#
      • 1...Rg7
        • 2.Bc5#
        • 2.Qxc3#
      • 1...Rh7
        • 2.Bc5#
        • 2.Qxc3#
      • 1...Rc6!
  • Keys
    • 1.Be7!
      • threat
        • 2.Bg5#
      • 1...Rxe7
        • 2.Qxc3#
      • 1...Bxe2
        • 2.Qg1#
      • 1...Rc5
        • 2.Bxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 7
  • Sets
    • R(g);N_GUARD::B(E),XR(g)
    • B(a);OGATE::QAB(A)
    • B(a);OGATE,XS(C)::QAB(A)
    • P(c);N_SPINP(c),OGATE,XQ(A)::B(E),XQ(c)
    • P(c);N_SPINP(c),OGATE,XQ(A)::B(E),XS(c)
    • P(c);N_SPINP(c),OGATE,XQ(A)::B(E),XB(c)
    • P(c);N_SPINP(c),OGATE,XQ(A)::B(E),XR(c)
  • Tries
    • Try
      • B(E);
      • Threat
        • B(E)
      • Vars
        • B(a);OGATE,XS(C)::QAB(A)
        • R(g);N_GUARD::B(E),XR(g)
      • Refutation
        • R(g);
  • Actual
    • B(E);
    • Threat
      • B(E)
    • Vars
      • R(g);N_GUARD,XB(E)::QAR2(A),XP(d)
      • B(a);OGATE,XS(C)::QAB(A)
      • R(g);N_GUARD::B(E),XR(g)
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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).