MESON Chess Problem Database

Problem Display
PID: 22558 (8/8/1qN5/3Q4/kP6/8/K1N5/8 w - - 0 1)

Lincoln, Robert A

US Problem Bulletin, 1987

8/8/1qN5/3Q4/kP6/8/K1N5/8

#2

5 + 2

2838 Fun with Chess Miniatures 1996
5454 Near Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Qg1
      • 2.Qa5#
    • 1...Qf2
      • 2.Qa5#
    • 1...Qe3
      • 2.Qa5#
    • 1...Qd4
      • 2.Qa5#
    • 1...Qa5
      • 2.Qxa5#
    • 1...Qb5
      • 2.Qb3#
    • 1...Qxc6
      • 2.Qxc6#
      • 2.Qa5#
    • 1...Qb7
      • 2.Qa5#
    • 1...Qb8
      • 2.Qa5#
  • Tries
    • 1.S2d4?
      • threat
        • 2.Qb3#
      • 1...Qxd4
        • 2.Qa5#
      • 1...Qxb4!
  • Keys
    • 1.Qc4!
      • threat
        • 2.b5#
      • 1...Qxb4
        • 2.Qxb4#
      • 1...Qxc6
        • 2.Qxc6#
      • 1...Qd4
        • 2.Qa6#
      • 1...Qa5
        • 2.bxa5#
      • 1...Qc5
        • 2.bxc5#
      • 1...Qb5
        • 2.Qb3#

Anticipated by 18469(1956)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • Q(b);N_GUARD::QAR1(D)
    • Q(b);N_GUARD,P_PINS(B)::QAR1(D)
    • Q(b);N_GUARD::QAR1(D),XQ(b)
    • Q(b);SBLOCK::QAB1(D)
  • Tries
    • Try
      • S(B);
      • Threat
        • QAB1(D)
      • Vars
        • Q(b);N_GUARD,XS(B)::QAR1(D)
      • Refutation
        • Q(b);XP(C)
  • Actual
    • Q(D);
    • Threat
      • QAR(D)+P(C)
    • Vars
      • Q(b);OGATE,P_SPINQ(b),XP(C)::QAR1(D),XQ(b)
      • Q(b);OGATE,XS(E)::QAB(D),XQ(b)
      • Q(b);N_GUARD::QAR2(D)
      • Q(b);OGATE::QAR(D)+P(C),XQ(b)
      • Q(b);SBLOCK::QAB1(D)
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).