MESON Chess Problem Database

Problem Display
PID: 172491 (8/8/8/8/1N1K4/8/pk6/1rRQ4 w - - 0 1)

Andreev, Aleksandr Grigorevich

Kuban segodniya, 2001

8/8/8/8/1N1K4/8/pk6/1rRQ4

#2

4 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Tries
    • 1.Qc2+?
      • 1...Ka1
        • 2.Qxa2#
        • 2.Qc3#
      • 1...Ka3!
    • 1.Qb3+?
      • 1...Ka1
        • 2.Sc2#
        • 2.Qxa2#
        • 2.Qc3#
      • 1...Kxc1
        • 2.Qc2#
      • 1...Kxb3!
    • 1.Qd3?
      • threat
        • 2.Qc3#
      • 1...Ka1
        • 2.Qc3#
      • 1...Kxc1
        • 2.Qc2#
      • 1...Rxc1!
  • Keys
    • 1.Qa4!
      • 1...Ka1
        • 2.Qxa2#
      • 1...Kxc1
        • 2.Qc2#
      • 1...Rxc1
        • 2.Qxa2#
      • 1...a1Q
        • 2.Sd3#
        • 2.Rc2#
      • 1...a1S
        • 2.Sd3#
      • 1...a1B
        • 2.Sd3#
        • 2.Rc2#
      • 1...a1R
        • 2.Sd3#
        • 2.Rc2#
      • 1...Ra1
        • 2.Sd3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(B);CHECK
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);S_FLIGHT,XR(A)::QAR1(B)
      • Refutation
        • K(c);P-FLIGHT,XQ(B)
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • K(c);P_SPINR(a),S_FLIGHT::QAB(B)
        • K(c);S_FLIGHT,XR(A)::QAR1(B)
      • Refutation
        • R(a);XR(A)
  • Actual
    • Q(B);
    • Vars
      • K(c);P_SPINP(b),P_SPINR(a),S_FLIGHT::QAR1(B),XP(b)
      • K(c);S_FLIGHT,XR(A)::QAR1(B)
      • R(a);SBLOCK,XR(A)::QAR1(B),XP(b)
      • P(b);::S(C)
      • R(a);::S(C)
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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).