MESON Chess Problem Database

Problem Display
PID: 265879 (8/3Q4/2R5/8/3ppp2/3k4/8/4K3 w - - 0 1)

Lincoln, Robert A

The Problemist, 1996

8/3Q4/2R5/8/3ppp2/3k4/8/4K3

#2

3 + 4

3713 Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...e3
      • 2.Qf5#
      • 2.Qh7#
  • Tries
    • 1.Qh3+?
      • 1...e3
        • 2.Qf5#
        • 2.Qh7#
      • 1...f3!
    • 1.Qg4?
      • threat
        • 2.Qe2#
      • 1...Ke3
        • 2.Qe2#
      • 1...e3
        • 2.Qf5#
        • 2.Qg6#
      • 1...f3!
    • 1.Qe6?
      • threat
        • 2.Qb3#
      • 1...e3
        • 2.Qf5#
        • 2.Qg6#
      • 1...Ke3!
    • 1.Qd5?
      • threat
        • 2.Qb3#
      • 1...e3
        • 2.Qf5#
      • 1...Ke3!
    • 1.Qd6?
      • threat
        • 2.Qa3#
      • 1...e3
        • 2.Qg6#
      • 1...Ke3!
    • 1.Qb7?
      • threat
        • 2.Qb3#
      • 1...e3
        • 2.Qb1#
        • 2.Qh7#
      • 1...Ke3!
    • 1.Qe7?
      • threat
        • 2.Qa3#
      • 1...e3
        • 2.Qh7#
      • 1...Ke3!
    • 1.Qf7?
      • threat
        • 2.Qb3#
      • 1...e3
        • 2.Qg6#
        • 2.Qf5#
        • 2.Qh7#
      • 1...Ke3!
  • Keys
    • 1.Qa7!
      • threat
        • 2.Qa3#
      • 1...Ke3
        • 2.Rc3#
      • 1...e3
        • 2.Qh7#

Anticipated by 38164(1968)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(C);CHECK,N_PINP(b)
      • Refutation
        • P(d);P_SPINP(d)
    • Try
      • Q(C);N_PINP(b)
      • Threat
        • QAB1(C)
      • Vars
        • K(a);P-FLIGHT::QAR1(C)
      • Refutation
        • P(d);
    • Try
      • Q(C);N_PINP(b)
      • Threat
        • QAR2(C)
      • Refutation
        • K(a);P-FLIGHT,P_SPINP(c)
    • Try
      • Q(C);
      • Threat
        • QAR2(C)
      • Vars
        • P(c);OGATEB,SBLOCK::QAB(C)
      • Refutation
        • K(a);N_SPINP(b),P-FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAR(C)
      • Vars
        • P(c);OGATEB,SBLOCK::QAB(C)
      • Refutation
        • K(a);N_SPINP(b),P-FLIGHT
    • Try
      • Q(C);N_PINP(b)
      • Threat
        • QAR2(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(C);N_PINP(b)
      • Threat
        • QAR(C)
      • Vars
        • P(c);OGATEB,SBLOCK::QAB(C)
      • Refutation
        • K(a);P-FLIGHT,P_SPINP(c)
    • Try
      • Q(C);N_PINP(b)
      • Threat
        • QAR2(C)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(C);N_PINP(b)
    • Threat
      • QAR(C)
    • Vars
      • K(a);N_GUARD,P-FLIGHT,P_SPINP(b)::R(B)
      • P(c);OGATEB,SBLOCK::QAB(C)
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).