MESON Chess Problem Database

Problem Display
PID: 99183 (2b5/bQ1p4/2p1B3/4p3/R2pk2N/8/2P1p1N1/2n1B1K1 w - - 0 1)

Howell, Clarence Seaman

Magyar Sakkelet, 1968

2b5/bQ1p4/2p1B3/4p3/R2pk2N/8/2P1p1N1/2n1B1K1

#2

8 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...dxe6
      • 2.Qxc6#
    • 1...d5
      • 2.Qh7#
    • 1...d6
      • 2.Qh7#
  • Tries
    • 1.Qxc6+?
      • 1...d5
        • 2.Bxd5#
        • 2.Qxd5#
      • 1...dxc6!
    • 1.Qb3?
      • threat
        • 2.Bf5#
        • 2.Qe3#
        • 2.Qf3#
      • 1...dxe6
        • 2.Qf3#
      • 1...Sd3
        • 2.Bf5#
        • 2.Qxd3#
        • 2.cxd3#
      • 1...d5
        • 2.Qe3#
        • 2.Qf3#
      • 1...d6
        • 2.Qe3#
        • 2.Qf3#
      • 1...Sxb3!
    • 1.Qxd7?
      • threat
        • 2.Bf5#
        • 2.Qxc6#
        • 2.Qh7#
      • 1...Bb7
        • 2.Bf5#
        • 2.Qh7#
      • 1...c5
        • 2.Bd5#
        • 2.Bf5#
        • 2.Qc6#
        • 2.Qd5#
        • 2.Qh7#
      • 1...Bxd7!
  • Keys
    • 1.c4!
      • threat
        • 2.Bf5#
      • 1...d3+
        • 2.c5#
      • 1...Kd3
        • 2.Qb1#
      • 1...dxe6
        • 2.Qh7#
      • 1...d5
        • 2.Qh7#
      • 1...d6
        • 2.Qh7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(h);N_GUARD,XB(G)::QAB(H),XP(f)
    • P(h);OGATE::QAB(H)
  • Tries
    • Try
      • Q(H);CHECK,XP(f)
      • Refutation
        • P(h);XQ(H)
    • Try
      • Q(H);
      • Threat
        • DUALS(3)
      • Vars
        • P(h);XB(G)::QAB1(H)
      • Refutation
        • S(a);XQ(H)
    • Try
      • Q(H);XP(h)
      • Threat
        • DUALS(3)
      • Refutation
        • B(i);XQ(H)
  • Actual
    • P(C);N_PINP(c),P_PINP(f)
    • Threat
      • B(G)
    • Vars
      • P(c);CHECK,SBLOCK::R(E)+P(C)
      • K(d);N_SPINP(f),S_FLIGHT::QAB(H)
      • P(h);OGATE,XB(G)::QAB(H)
      • P(h);N_SPINP(f),OGATE::QAB(H)
      • P(h);OGATE::QAB(H)
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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).