MESON Chess Problem Database

Problem Display
PID: 96517 (8/1Qp5/p1P1PP2/5knP/3BRP1R/8/3NK3/8 w - - 0 1)

Lincoln, Robert A

US Problem Bulletin, 1989

8/1Qp5/p1P1PP2/5knP/3BRP1R/8/3NK3/8

#2

11 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...a5
      • 2.Qb5#
  • Tries
    • 1.Re3?
      • 1...Sxe6
        • 2.Qb1#
      • 1...Sf3
        • 2.Qb1#
      • 1...Sh3
        • 2.Qb1#
      • 1...Sf7
        • 2.Qb1#
      • 1...Sh7
        • 2.Qb1#
      • 1...a5
        • 2.Qb5#
      • 1...Se4!
    • 1.Qc8?
      • 1...Sxe4
        • 2.e7#
      • 1...Sxe6
        • 2.Qxe6#
      • 1...Sf3
        • 2.e7#
      • 1...Sh3
        • 2.e7#
      • 1...Sf7
        • 2.exf7#
        • 2.e7#
      • 1...Sh7
        • 2.e7#
      • 1...a5!
    • 1.Qb3?
      • threat
        • 2.Qd5#
      • 1...Sf7
        • 2.Qh3#
      • 1...Sf3!
    • 1.Qxc7?
      • threat
        • 2.Qa5#
        • 2.Qe5#
      • 1...Sxe4
        • 2.Qe5#
      • 1...Sxe6
        • 2.Qe5#
        • 2.Qh7#
      • 1...Sf3
        • 2.Qh7#
      • 1...a5
        • 2.Qxa5#
        • 2.Qe5#
      • 1...Sf7!
    • 1.e7?
      • 1...Sxe4
        • 2.Qc8#
      • 1...Sf3
        • 2.Qc8#
      • 1...Sh3
        • 2.Qc8#
      • 1...Sf7
        • 2.Qc8#
      • 1...Sh7
        • 2.Qc8#
      • 1...a5
        • 2.Qb5#
      • 1...Se6!
  • Keys
    • 1.Qb1!
      • 1...Sxe4
        • 2.Qxe4#
      • 1...Sxe6
        • 2.Re3#
      • 1...Sf3
        • 2.Re3#
      • 1...Sh3
        • 2.Re3#
      • 1...Sf7
        • 2.Re3#
      • 1...Sh7
        • 2.Re3#
      • 1...a5
        • 2.Qb5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • P(c);N_GUARD::QAR(K)
  • Tries
    • Try
      • R(D);
      • Vars
        • S(b);N_GUARD,XP(I)::QAB(K)
        • S(b);N_GUARD::QAB(K)
        • P(c);N_GUARD::QAR(K)
      • Refutation
        • S(b);
    • Try
      • Q(K);
      • Vars
        • S(b);N_GUARD,XR(D)::QAB(K)+P(I)
        • S(b);OGATE,P_SPINS(b),XP(I)::QAB1(K),XS(b)
        • S(b);N_GUARD::QAB(K)+P(I)
      • Refutation
        • P(c);
    • Try
      • Q(K);
      • Threat
        • QAR2(K)
      • Vars
        • S(b);N_GUARD::QAB(K)
      • Refutation
        • S(b);
    • Try
      • Q(K);XP(d)
      • Threat
        • DUALS(2)
      • Vars
        • S(b);XR(D)::QAR1(K)
        • S(b);N_GUARD::QAB(K)
      • Refutation
        • S(b);
    • Try
      • P(I);
      • Vars
        • S(b);N_GUARD,XR(D)::QAB(K)
        • S(b);N_GUARD::QAB(K)
        • P(c);N_GUARD::QAR(K)
      • Refutation
        • S(b);
  • Actual
    • Q(K);
    • Vars
      • S(b);OGATE,P_SPINS(b),XR(D)::QAB1(K),XS(b)
      • S(b);N_GUARD,XP(I)::QAB(K)+R(D)
      • S(b);N_GUARD::QAB(K)+R(D)
      • P(c);N_GUARD::QAR(K)
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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).