MESON Chess Problem Database

Problem Display
PID: 59790 (5B2/8/3K1Q2/7k/8/8/2B4P/6r1 w - - 0 1)

Lincoln, Robert A

3rd HM., Melnichenko JT, 2004

5B2/8/3K1Q2/7k/8/8/2B4P/6r1

#2

5 + 2

145 StrateGems 2005
145 StrateGems 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rd1+
      • 2.Bxd1#
    • 1...Rg4
      • 2.Qh6#
  • Tries
    • 1.Bd1+?
      • 1...Rg4
        • 2.Qh6#
      • 1...Rxd1+!
    • 1.Qf5+?
      • 1...Rg5
        • 2.Qh3#
      • 1...Kh4!
    • 1.h3?
      • threat
        • 2.Qh6#
      • 1...Rd1+
        • 2.Bxd1#
      • 1...Rg6
        • 2.Bxg6#
      • 1...Rg7!
  • Keys
    • 1.Be7!
      • threat
        • 2.Qh4#
      • 1...Rd1+
        • 2.Bxd1#
      • 1...Kg4
        • 2.Qf5#
      • 1...Rg5
        • 2.Qxg5#
      • 1...Rg6
        • 2.Qxg6#
      • 1...Rg4
        • 2.Qh8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(a);CHECK,N_GUARD::B(A),XR(a)
    • R(a);SBLOCK::QAR1(D)
  • Tries
    • Try
      • B(A);CHECK
      • Vars
        • R(a);P_SPINR(a)::QAR1(D)
      • Refutation
        • R(a);CHECK,XB(A)
    • Try
      • Q(D);CHECK
      • Vars
        • R(a);P_SPINR(a),SBLOCK::QAR2(D)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • P(B);
      • Threat
        • QAR1(D)
      • Vars
        • R(a);CHECK,N_GUARD::B(A),XR(a)
        • R(a);N_GUARD,P_PINQ(D)::B(A),XR(a)
      • Refutation
        • R(a);
  • Actual
    • B(E);
    • Threat
      • QAR1(D)
    • Vars
      • R(a);CHECK,N_GUARD::B(A),XR(a)
      • K(b);S_FLIGHT::QAB1(D)
      • R(a);N_GUARD::QAR1(D),XR(a)
      • R(a);N_GUARD,P_PINQ(D)::QAB1(D),XR(a)
      • R(a);SBLOCK::QAR(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).