MESON Chess Problem Database

Problem Display
PID: 96514 (8/5p2/N4B2/3p1N2/8/3k2K1/P2n4/3Q4 w - - 0 1)

Lincoln, Robert A

US Problem Bulletin, 1988

8/5p2/N4B2/3p1N2/8/3k2K1/P2n4/3Q4

#2

6 + 4

6490 yacpdb 2009
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kc4
      • 2.Qe2#
    • 1...Ke4
      • 2.Qc2#
  • Tries
    • 1.Kf4?
      • 1...Kc4
        • 2.Qe2#
      • 1...d4!
    • 1.Kg4?
      • 1...Kc4
        • 2.Qe2#
      • 1...Ke4
        • 2.Sc5#
        • 2.Qc2#
        • 2.Qe2#
      • 1...d4!
    • 1.Sb4+?
      • 1...Ke4
        • 2.Qc2#
        • 2.Qg4#
      • 1...Kc4!
    • 1.Bd4?
      • 1...Kc4
        • 2.Qe2#
      • 1...Ke4
        • 2.Qc2#
      • 1...f6!
    • 1.Qf1+?
      • 1...Kc2
        • 2.Se3#
        • 2.Sb4#
      • 1...Ke4
        • 2.Sc5#
      • 1...Sxf1+!
    • 1.Qxd2+?
      • 1...Kc4
        • 2.Sd6#
        • 2.Qe2#
      • 1...Ke4
        • 2.Sd6#
        • 2.Qc2#
      • 1...Kxd2!
    • 1.a4?
      • 1...Kc4
        • 2.Qc2#
      • 1...Ke4
        • 2.Qc2#
      • 1...d4!
  • Keys
    • 1.Sd4!
      • 1...Kc3
        • 2.Qc2#
      • 1...Ke3
        • 2.Qe2#
      • 1...Kc4
        • 2.Qc2#
      • 1...Ke4
        • 2.Qe2#

Anticipated by 16715(1942), 9835(1960)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(b);N_SPINS(a),S_FLIGHT::QAB(A)
  • Tries
    • Try
      • K(C);S_FLIGHT
      • Vars
        • K(b);N_SPINS(a),S_FLIGHT::QAB(A)
      • Refutation
        • P(c);
    • Try
      • K(C);P-FLIGHT
      • Vars
        • K(b);N_SPINS(a),S_FLIGHT::QAB(A)
      • Refutation
        • P(c);
    • Try
      • S(E);CHECK
      • Refutation
        • K(b);N_SPINS(a),S_FLIGHT
    • Try
      • B(F);
      • Vars
        • K(b);N_SPINS(a),S_FLIGHT::QAB(A)
      • Refutation
        • P(d);
    • Try
      • Q(A);CHECK,N_PINS(a)
      • Vars
        • K(b);S_FLIGHT::S(E)
      • Refutation
        • S(a);CHECK,XQ(A)
    • Try
      • Q(A);CHECK,XS(a)
      • Refutation
        • K(b);P-FLIGHT,XQ(A)
    • Try
      • P(B);
      • Vars
        • K(b);N_SPINS(a),S_FLIGHT::QAR2(A)
        • K(b);N_SPINS(a),S_FLIGHT::QAB(A)
      • Refutation
        • P(c);
  • Actual
    • S(D);
    • Vars
      • K(b);N_SPINS(a),P-FLIGHT::QAR1(A)
      • K(b);N_SPINS(a),S_FLIGHT::QAR2(A)
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).