MESON Chess Problem Database

Problem Display
PID: 88115 (Q7/B2R1P2/4PK1p/2bP3b/1P1kp1p1/Nn1pn1P1/1P3P2/5B2 w - - 0 1)

Allen, Frederick B

The Problemist, 1930

Q7/B2R1P2/4PK1p/2bP3b/1P1kp1p1/Nn1pn1P1/1P3P2/5B2

#2

13 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sa1
      • 2.Bxc5#
    • 1...Sc1
      • 2.Bxc5#
    • 1...Sd2
      • 2.Bxc5#
    • 1...Sa5
      • 2.Bxc5#
    • 1...Sc4
      • 2.Sb5#
    • 1...Sxd5+
      • 2.Rxd5#
      • 2.Qxd5#
    • 1...d2
      • 2.Sb5#
  • Tries
    • 1.Qb8?
      • threat
        • 2.Qe5#
      • 1...Sc4
        • 2.Sb5#
      • 1...Sxd5+!
  • Keys
    • 1.Qh8!
      • 1...Sxd5+
        • 2.Kf5#
      • 1...Bxa7
        • 2.Ke7#
      • 1...Bxf7
        • 2.Kxf7#
      • 1...Sxf1
        • 2.Kf5#
      • 1...Bb6
        • 2.Ke7#
      • 1...Bg6
        • 2.Kxg6#
      • 1...Sa1
        • 2.Bxc5#
      • 1...Sc1
        • 2.Bxc5#
      • 1...Sd2
        • 2.Bxc5#
      • 1...Sa5
        • 2.Bxc5#
      • 1...Sd1
        • 2.Kf5#
      • 1...Sc2
        • 2.Kf5#
      • 1...Sg2
        • 2.Kf5#
      • 1...Sc4
        • 2.Sb5#
      • 1...Sf5
        • 2.Kxf5#
      • 1...d2
        • 2.Sb5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 10
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::B(J),XB(g)
    • S(c);SBLOCK::S(D)
    • P(b);::S(D)
  • Tries
    • Try
      • Q(M);
      • Threat
        • QAB1(M)
      • Vars
        • S(c);SBLOCK::S(D)
      • Refutation
        • S(c);CHECK,P_SPINS(c),XP(G)
  • Actual
    • Q(M);
    • Vars
      • S(c);CHECK,P_SPINS(c),XP(G)::QAB(M)+K(I)
      • B(g);N_SPINB(g),XB(J)::QAB(M)+K(I)
      • B(h);XP(L)::QAB(M)+K(I),XB(h)
      • S(c);XB(A)::QAB(M)+K(I)
      • B(g);::QAB(M)+K(I)
      • B(h);::QAB(M)+K(I),XB(h)
      • S(a);N_GUARD::B(J),XB(g)
      • S(c);::QAB(M)+K(I)
      • S(c);SBLOCK::S(D)
      • S(c);::QAB(M)+K(I),XS(c)
      • P(b);::S(D)
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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).