MESON Chess Problem Database

Problem Display
PID: 172474 (1N1B4/p7/1r6/1k6/8/2K5/2Q5/8 w - - 0 1)

Andreev, Aleksandr Grigorevich

Kuban segodniya, 2001

1N1B4/p7/1r6/1k6/8/2K5/2Q5/8

#2

4 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Tries
    • 1.Kb3?
      • threat
        • 2.Qf5#
      • 1...Rxb8
        • 2.Qc4#
      • 1...Rc6
        • 2.Qxc6#
      • 1...Rd6
        • 2.Qc4#
      • 1...Re6
        • 2.Qc4#
      • 1...Rf6
        • 2.Qc4#
      • 1...Ka5+!
    • 1.Qb3+?
      • 1...Ka5
        • 2.Qb4#
      • 1...Kc5!
    • 1.Qe2+?
      • 1...Ka5
        • 2.Qa6#
      • 1...Kc5
        • 2.Qe5#
      • 1...Ka4!
  • Keys
    • 1.Qe4!
      • threat
        • 2.Qb4#
      • 1...Rc6+
        • 2.Qxc6#
      • 1...Ka5
        • 2.Qb4#
      • 1...Kc5
        • 2.Qe5#
      • 1...Rxb8
        • 2.Qc4#
      • 1...a5
        • 2.Qc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Threat
        • QAR(A)
      • Vars
        • R(b);XS(C)::QAB1(A)
        • R(b);N_GUARD::QAB1(A),XR(b)
        • R(b);::QAB1(A)
      • Refutation
        • K(a);CHECK,P-FLIGHT,P_SPINR(b)
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);P-FLIGHT,P_SPINR(b)::QAB1(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);OGATE,P-FLIGHT,P_SPINR(b)::QAR1(A)
        • K(a);P-FLIGHT::QAR2(A)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • R(b);CHECK,N_GUARD::QAB1(A),XR(b)
      • K(a);P-FLIGHT,P_SPINR(b)::QAB1(A)
      • K(a);P-FLIGHT::QAR2(A)
      • R(b);XS(C)::QAB1(A)
      • P(c);SBLOCK::QAB1(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).