MESON Chess Problem Database

Problem Display
PID: 172350 (8/8/8/8/8/3Q4/R1KN1kp1/7n w - - 0 1)

Andreev, Aleksandr Grigorevich

Aktsent, 1997

8/8/8/8/8/3Q4/R1KN1kp1/7n

#2

4 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ke1
      • 2.Qe3#
  • Tries
    • 1.Se4+?
      • 1...Ke1
        • 2.Ra1#
        • 2.Qd1#
      • 1...Kg1!
    • 1.Ra1?
      • threat
        • 2.Se4#
        • 2.Qf3#
      • 1...g1Q
        • 2.Qf3#
      • 1...g1B
        • 2.Qf3#
      • 1...g1R
        • 2.Qf3#
      • 1...Sg3
        • 2.Qf3#
      • 1...g1S!
    • 1.Qf3+?
      • 1...Ke1
        • 2.Ra1#
        • 2.Qe3#
      • 1...Kg1!
  • Keys
    • 1.Kd1!
      • 1...g1Q+
        • 2.Sf1#
      • 1...g1R+
        • 2.Sf1#
      • 1...Kg1
        • 2.Sf3#
      • 1...g1S
        • 2.Se4#
      • 1...g1B
        • 2.Sb1#
        • 2.Sf1#
        • 2.Sb3#
        • 2.Sc4#
        • 2.Se4#
        • 2.Qf3#
      • 1...Sg3
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • K(b);S_FLIGHT::QAR2(D)
  • Tries
    • Try
      • S(C);CHECK
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • R(A);
      • Threat
        • DUALS(2)
      • Vars
        • P(c);::QAR1(D)
        • S(a);::QAR1(D)
      • Refutation
        • P(c);
    • Try
      • Q(D);CHECK
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • K(B);S_FLIGHT
    • Vars
      • P(c);CHECK,SBLOCK::R(A)+S(C)
      • K(b);S_FLIGHT::S(C)
      • P(c);SBLOCK::R(A)+S(C),DCHECK
      • S(a);SBLOCK::QAB(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).