MESON Chess Problem Database

Problem Display
PID: 172499 (8/8/8/8/8/1KQR4/4k3/4nRr1 w - - 0 1)

Andreev, Aleksandr Grigorevich

Kuban segodniya, 2001

8/8/8/8/8/1KQR4/4k3/4nRr1

#2

4 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rxf1
      • 2.Rd2#
      • 2.Qd2#
  • Tries
    • 1.Rxe1+?
      • 1...Kf2
        • 2.Qd2#
      • 1...Rxe1!
    • 1.Re3+?
      • 1...Kd1
        • 2.Rexe1#
        • 2.Qxe1#
        • 2.Qc2#
      • 1...Kxf1!
  • Keys
    • 1.Rd1!
      • threat
        • 2.Rdxe1#
        • 2.Qxe1#
      • 1...Kxd1
        • 2.Qxe1#
        • 2.Qc2#
      • 1...Kxf1
        • 2.Qf3#
      • 1...Rxf1
        • 2.Rd2#
      • 1...Rg3
        • 2.Rdxe1#
      • 1...Sc2
        • 2.Qd2#
        • 2.Qd3#
        • 2.Qf3#
      • 1...Sg2
        • 2.Qd2#
        • 2.Qd3#
        • 2.Qf3#
      • 1...Sd3
        • 2.Qd2#
        • 2.Qxd3#
      • 1...Sf3
        • 2.Qd3#
        • 2.Qxf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(A);CHECK,XS(a)
      • Vars
        • K(c);P-FLIGHT::QAR2(C)
      • Refutation
        • R(b);XR(A)
    • Try
      • R(D);CHECK
      • Refutation
        • K(c);S_FLIGHT,XR(A)
  • Actual
    • R(D);
    • Threat
      • DUALS(2)
    • Vars
      • K(c);P_SPINS(a),S_FLIGHT,XR(A)::QAR2(C)
      • R(b);SBLOCK,XR(A)::R1(D)
      • R(b);P_PINQ(C)::R1(D),XS(a)
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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).