MESON Chess Problem Database

Problem Display
PID: 234670 (Nb6/3p4/2k5/1R6/K6Q/8/8/8 w - - 0 1)

Lincoln, Robert A

Kudesnik, 2009

Nb6/3p4/2k5/1R6/K6Q/8/8/8

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kd6
      • 2.Qf6#
    • 1...Bd6
      • 2.Qh1#
      • 2.Qe4#
  • Tries
    • 1.Qf6+?
      • 1...Bd6
        • 2.Qf3#
      • 1...d6!
    • 1.Qe7?
      • threat
        • 2.Qc5#
      • 1...d6
        • 2.Qb7#
        • 2.Qe8#
      • 1...Bd6
        • 2.Qe4#
      • 1...d5
        • 2.Rc5#
        • 2.Rb6#
      • 1...Ba7!
    • 1.Qh1+?
      • 1...d5
        • 2.Qxd5#
      • 1...Kd6!
    • 1.Qd4?
      • threat
        • 2.Rb6#
        • 2.Qc5#
        • 2.Qb6#
        • 2.Qd5#
      • 1...d5
        • 2.Qxd5#
      • 1...Ba7
        • 2.Qd5#
      • 1...Bd6
        • 2.Rb6#
        • 2.Qb6#
        • 2.Qe4#
        • 2.Qd5#
      • 1...Bc7
        • 2.Qc5#
        • 2.Qd5#
      • 1...d6!
    • 1.Qe4+?
      • 1...d5
        • 2.Qxd5#
      • 1...Kd6!
    • 1.Qh6+?
      • 1...Bd6
        • 2.Qh1#
      • 1...d6!
  • Keys
    • 1.Qd8!
      • threat
        • 2.Qb6#
      • 1...Kd6
        • 2.Qf6#
      • 1...Ba7
        • 2.Qc7#
      • 1...Bc7
        • 2.Qxc7#
      • 1...d5
        • 2.Qxd5#
      • 1...d6
        • 2.Qe8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT::QAR2(B)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • B(c);P_SPINB(c),SBLOCK,S_CUTP(b)::QAB(B)
      • Refutation
        • P(b);P_SPINP(b)
    • Try
      • Q(B);
      • Threat
        • QAR1(B)
      • Vars
        • B(c);SBLOCK,S_CUTP(b)::QAB(B)
      • Refutation
        • B(c);
    • Try
      • Q(B);CHECK
      • Vars
        • P(b);P_SPINP(b)::QAB1(B),XP(b)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);
      • Threat
        • DUALS(4)
      • Vars
        • P(b);::QAB1(B),XP(b)
        • B(c);::QAB1(B)
      • Refutation
        • P(b);
    • Try
      • Q(B);CHECK
      • Vars
        • P(b);P_SPINP(b)::QAB1(B),XP(b)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • B(c);P_SPINB(c),SBLOCK,S_CUTP(b)::QAB(B)
      • Refutation
        • P(b);P_SPINP(b)
  • Actual
    • Q(B);
    • Threat
      • QAR1(B)
    • Vars
      • K(a);P-FLIGHT,P_SPINP(b)::QAR2(B)
      • B(c);N_GUARD::QAR1(B)
      • B(c);N_GUARD::QAR1(B),XB(c)
      • P(b);OGATE::QAB1(B),XP(b)
      • P(b);OGATEB,SBLOCK::QAB(B)
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).