MESON Chess Problem Database

Problem Display
PID: 197920 (4Q3/1bN3P1/3p3K/1B1n1R2/2rk4/P3RP2/8/4B3 w - - 0 1)

Petrov, Evgeny Aleksandrovich

Stella Polaris, 1966

4Q3/1bN3P1/3p3K/1B1n1R2/2rk4/P3RP2/8/4B3

#2

10 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Rc5
      • 2.Rd3#
      • 2.Re4#
      • 2.Qe4#
    • 1...Rc6
      • 2.Rxd5#
    • 1...Ba6
      • 2.Rxd5#
    • 1...Bc8
      • 2.Rxd5#
  • Tries
    • 1.Rd3+?
      • 1...Kxd3
        • 2.Qe4#
      • 1...Kc5!
  • Keys
    • 1.Bf2!
      • threat
        • 2.Se6#
      • 1...Kc5
        • 2.Rc3#
      • 1...Rxc7
        • 2.Rd3#
      • 1...Sxe3
        • 2.Qxe3#
      • 1...Sxc7
        • 2.Rb3#
      • 1...Bc8
        • 2.Rxd5#
      • 1...Sf4
        • 2.Rb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • R(a);S_CUTB(e)::R1(F),XS(c)
    • B(e);N_GUARD::R1(F),XS(c)
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • K(b);P-FLIGHT,P_SPINR(a),XR(C)::QAB1(J)
      • Refutation
        • K(b);P_SPINS(c),S_FLIGHT
  • Actual
    • B(A);
    • Threat
      • S(H)
    • Vars
      • K(b);P_SPINS(c),S_FLIGHT::B(A)+R(C)
      • R(a);XS(H)::B(A)+R(C),DCHECK
      • S(c);OGATE,P_SPINS(c),XR(C)::QAB1(J),XS(c)
      • S(c);N_GUARD,XS(H)::B(A)+R(C)
      • B(e);N_GUARD::R1(F),XS(c)
      • S(c);N_GUARD::B(A)+R(C)
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).