MESON Chess Problem Database

Problem Display
PID: 152220 (5N2/b4pn1/2K1B3/1pP1k3/4n2q/p4R2/4R3/2B3Q1 w - - 0 1)

McAllister, George W

4th Prize, Good Companions (April), 1914

5N2/b4pn1/2K1B3/1pP1k3/4n2q/p4R2/4R3/2B3Q1

#2

8 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Bxc5
      • 2.Qxc5#
    • 1...Sf5
      • 2.Rxf5#
    • 1...Sh5
      • 2.Rf5#
    • 1...Sxe6
      • 2.Sd7#
    • 1...Se8
      • 2.Rf5#
    • 1...a2
      • 2.Bb2#
    • 1...fxe6
      • 2.Sg6#
      • 2.Sd7#
  • Tries
    • 1.Bf4+?
      • 1...Qxf4
        • 2.Qa1#
      • 1...Kf6!
    • 1.Rxe4+?
      • 1...Kxe4
        • 2.Qe3#
      • 1...Qxe4+!
    • 1.Qe3?
      • threat
        • 2.Qc3#
      • 1...Bxc5
        • 2.Qxc5#
      • 1...Sxe6
        • 2.Sd7#
      • 1...Sf5
        • 2.Rxf5#
      • 1...Qe1
        • 2.Qxe4#
      • 1...Qf2
        • 2.Qxe4#
      • 1...Qd8
        • 2.Qxe4#
      • 1...b4!
    • 1.Qxg7+?
      • 1...Qf6
        • 2.Qxf6#
      • 1...f6!
  • Keys
    • 1.Bg5!
      • threat
        • 2.Qa1#
      • 1...Bxc5
        • 2.Qxc5#
      • 1...Sxe6
        • 2.Sd7#
      • 1...Qf2
        • 2.Bf6#
      • 1...Qe1
        • 2.Bf6#
      • 1...Qh1
        • 2.Bf6#
      • 1...Sf5
        • 2.Rxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • B(f);OGATE,XP(E)::QAR2(B),XB(f)
    • S(h);N_GUARD::R1(D),XS(h)
    • S(h);N_GUARD::R1(D)
    • S(h);SBLOCK,XB(G)::S(H)
    • P(a);N_GUARD::B(A)
  • Tries
    • Try
      • B(A);CHECK
      • Vars
        • Q(c);XB(A)::QAB(B)
      • Refutation
        • K(e);N_SPINS(b),S_FLIGHT
    • Try
      • R(C);CHECK,XS(b)
      • Vars
        • K(e);P-FLIGHT,XR(C)::QAR1(B)
      • Refutation
        • Q(c);CHECK,XR(C)
    • Try
      • Q(B);
      • Threat
        • QAB(B)
      • Vars
        • B(f);OGATE,XP(E)::QAR2(B),XB(f)
        • S(h);SBLOCK,XB(G)::S(H)
        • S(h);N_GUARD::R1(D),XS(h)
        • Q(c);N_GUARD::QAR1(B),XS(b)
      • Refutation
        • P(d);
    • Try
      • Q(B);CHECK,XS(h)
      • Vars
        • Q(c);N_GUARD,P_PINB(G),P_SPINQ(c)::QAB1(B),XQ(c)
      • Refutation
        • P(g);P_SPINP(g)
  • Actual
    • B(A);
    • Threat
      • QAB(B)
    • Vars
      • B(f);OGATE,XP(E)::QAR2(B),XB(f)
      • S(h);SBLOCK,XB(G)::S(H)
      • Q(c);N_GUARD::B(A)
      • S(h);N_GUARD::R1(D),XS(h)
HTML5 logo

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).