MESON Chess Problem Database

Problem Display
PID: 172422 (1k2K3/Rq2N3/B7/8/Q7/8/8/8 w - - 0 1)

Andreev, Aleksandr Grigorevich

Kuban segodniya, 1997

1k2K3/Rq2N3/B7/8/Q7/8/8/8

#2

5 + 2

6490 yacpdb 2018
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qc6+
      • 2.Sxc6#
    • 1...Qb1
      • 2.Sc6#
    • 1...Qb2
      • 2.Sc6#
    • 1...Qb3
      • 2.Sc6#
    • 1...Qb4
      • 2.Sc6#
  • Tries
    • 1.Qb3?
      • threat
        • 2.Qxb7#
      • 1...Qb5+
        • 2.Sc6#
      • 1...Kxa7
        • 2.Qxb7#
      • 1...Qxb3
        • 2.Sc6#
      • 1...Qb4
        • 2.Sc6#
      • 1...Qb6
        • 2.Sc6#
        • 2.Qxb6#
      • 1...Kc7!
    • 1.Qf4+?
      • 1...Qc7
        • 2.Sc6#
        • 2.Qxc7#
      • 1...Kxa7!
  • Keys
    • 1.Qb4!
      • threat
        • 2.Qxb7#
      • 1...Qb5+
        • 2.Sc6#
      • 1...Kxa7
        • 2.Qxb7#
      • 1...Kc7
        • 2.Rxb7#
      • 1...Qxb4
        • 2.Sc6#
      • 1...Qb6
        • 2.Sc6#
        • 2.Qxb6#

Anticipated by 2513(1859)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • Q(a);CHECK,N_GUARD::S(D),XQ(a)
    • Q(a);N_GUARD::S(D)
  • Tries
    • Try
      • Q(A);P_PINQ(a)
      • Threat
        • QAR1(A),XQ(a)
      • Vars
        • Q(a);CHECK::S(D)
        • K(b);N_SPINQ(a),S_FLIGHT,XR(C)::QAR1(A),XQ(a)
        • Q(a);N_SPINQ(a),XQ(A)::S(D)
        • Q(a);::S(D)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Refutation
        • K(b);S_FLIGHT,XR(C)
  • Actual
    • Q(A);P_PINQ(a)
    • Threat
      • QAR1(A),XQ(a)
    • Vars
      • Q(a);CHECK::S(D)
      • K(b);N_SPINQ(a),S_FLIGHT,XR(C)::QAR1(A),XQ(a)
      • K(b);S_FLIGHT::R1(C),XQ(a)
      • Q(a);N_SPINQ(a),XQ(A)::S(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).