MESON Chess Problem Database

Problem Display
PID: 134390 (8/5p1K/8/4Q1p1/6k1/8/8/4B2B w - - 0 1)

Lincoln, Robert A

Problem Observer, 2009

8/5p1K/8/4Q1p1/6k1/8/8/4B2B

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Kh3
      • 2.Qg3#
    • 1...Kh5
      • 2.Bf3#
  • Tries
    • 1.Kh6?
      • 1...Kh3
        • 2.Qg3#
      • 1...f5
        • 2.Qg3#
      • 1...f6!
    • 1.Bf3+?
      • 1...Kh3
        • 2.Qg3#
      • 1...Kxf3!
    • 1.Qg3+?
      • 1...Kh5
        • 2.Qh3#
      • 1...Kf5!
    • 1.Qe2+?
      • 1...Kh3
        • 2.Qh5#
        • 2.Qg2#
      • 1...Kf4
        • 2.Qe4#
      • 1...Kf5!
    • 1.Qe3?
      • threat
        • 2.Qf3#
      • 1...Kh5
        • 2.Qh3#
      • 1...Kf5!
    • 1.Qe4+?
      • 1...Kh3
        • 2.Qg2#
      • 1...Kh5!
    • 1.Qf5+?
      • 1...Kh5
        • 2.Bf3#
        • 2.Qh3#
      • 1...Kxf5!
    • 1.Qxg5+?
      • 1...Kh3
        • 2.Qh4#
        • 2.Qg2#
        • 2.Qg3#
        • 2.Qh5#
      • 1...Kxg5!
  • Keys
    • 1.Qd5!
      • threat
        • 2.Qf3#
      • 1...Kh3
        • 2.Qg2#
      • 1...Kf4
        • 2.Qe4#
      • 1...Kh5
        • 2.Bf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(a);S_FLIGHT::QAR1(C)
    • K(a);P_SPINP(b),S_FLIGHT::B(B)
  • Tries
    • Try
      • K(D);P-FLIGHT
      • Vars
        • K(a);S_FLIGHT::QAR1(C)
        • P(c);SBLOCK::QAR1(C)
      • Refutation
        • P(c);
    • Try
      • B(B);CHECK
      • Vars
        • K(a);S_FLIGHT::QAR1(C)
      • Refutation
        • K(a);S_FLIGHT,XB(B)
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);S_FLIGHT::QAR2(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • K(a);S_FLIGHT::QAR2(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB1(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Refutation
        • K(a);S_FLIGHT,XQ(C)
    • Try
      • Q(C);CHECK,XP(b)
      • Refutation
        • K(a);P-FLIGHT,XQ(C)
  • Actual
    • Q(C);
    • Threat
      • QAB1(C)
    • Vars
      • K(a);S_FLIGHT::QAB1(C)
      • K(a);P-FLIGHT::QAR1(C)
      • K(a);P_SPINP(b),S_FLIGHT::B(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).