MESON Chess Problem Database

Problem Display
PID: 172229 (2k5/r2R4/N3p3/4K3/8/8/8/3Q4 w - - 0 1)

Andreev, Aleksandr Grigorevich

Kuban segodniya, 1996

2k5/r2R4/N3p3/4K3/8/8/8/3Q4

#2

4 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rb7
      • 2.Rd8#
    • 1...Rc7
      • 2.Rxc7#
    • 1...Ra8
      • 2.Rc7#
  • Tries
    • 1.Kxe6?
      • 1...Rxd7
        • 2.Qxd7#
      • 1...Rc7
        • 2.Rxc7#
      • 1...Rb7
        • 2.Rd8#
      • 1...Ra8
        • 2.Rc7#
        • 2.Qc2#
        • 2.Qc1#
      • 1...Rxa6+!
    • 1.Qc2+?
      • 1...Rc7
        • 2.Qxc7#
      • 1...Kxd7!
    • 1.Qc1+?
      • 1...Rc7
        • 2.Qxc7#
      • 1...Kxd7!
    • 1.Qd5?
      • threat
        • 2.Rd8#
      • 1...Rxa6
        • 2.Qb7#
      • 1...Rxd7
        • 2.Qa8#
      • 1...exd5!
  • Keys
    • 1.Qd6!
      • 1...Rxa6
        • 2.Qc7#
      • 1...Rxd7
        • 2.Qb8#
      • 1...Rc7
        • 2.Rxc7#
        • 2.Qxc7#
      • 1...Rb7
        • 2.Rd8#
      • 1...Ra8
        • 2.Rc7#
        • 2.Qc7#
        • 2.Qc6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • R(b);SBLOCK::R1(D)
    • R(b);N_GUARD::R1(D),XR(b)
    • R(b);N_GUARD::R1(D)
  • Tries
    • Try
      • K(B);P-FLIGHT,XP(a)
      • Vars
        • R(b);OGATE,XR(D)::QAB1(A),XR(b)
        • R(b);N_GUARD::R1(D),XR(b)
        • R(b);SBLOCK::R1(D)
      • Refutation
        • R(b);CHECK,XS(C)
    • Try
      • Q(A);CHECK
      • Vars
        • R(b);N_GUARD,P_SPINR(b)::QAR1(A),XR(b)
      • Refutation
        • K(c);S_FLIGHT,XR(D)
    • Try
      • Q(A);CHECK
      • Vars
        • R(b);N_GUARD,P_SPINR(b)::QAR1(A),XR(b)
      • Refutation
        • K(c);S_FLIGHT,XR(D)
    • Try
      • Q(A);
      • Threat
        • R1(D)
      • Vars
        • R(b);N_GUARD,XS(C)::QAB1(A)
        • R(b);N_GUARD,SBLOCK,XR(D)::QAR2(A)
      • Refutation
        • P(a);XQ(A)
  • Actual
    • Q(A);
    • Vars
      • R(b);N_GUARD,XS(C)::QAR1(A)
      • R(b);SBLOCK,XR(D)::QAR1(A)
      • R(b);SBLOCK::R1(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).