MESON Chess Problem Database

Problem Display
PID: 86436 (3b4/qp4B1/1Q1np1K1/1P1k2pN/1PR4r/1NRp4/B7/8 w - - 0 1)

Rudenko, Valentin Fedorovich

Shedey, Sergey Oleksandrovich

Cervonij Prominj, 1979

3b4/qp4B1/1Q1np1K1/1P1k2pN/1PR4r/1NRp4/B7/8

#2

10 + 9

6490 yacpdb 2009
3713 Snap 2024

SOLUTION

  • SOUND
  • Sets
    • 1...Qb8
      • 2.Qc5#
    • 1...Qxa2
      • 2.Qc5#
    • 1...Qa3
      • 2.Qc5#
    • 1...Qa4
      • 2.Qc5#
    • 1...Qa5
      • 2.Qc5#
    • 1...Qa6
      • 2.Qc5#
    • 1...Qa8
      • 2.Qc5#
    • 1...Rh1
      • 2.Rd4#
    • 1...Rh2
      • 2.Rd4#
    • 1...Rh3
      • 2.Rd4#
    • 1...Rd4
      • 2.Rxd4#
    • 1...Re4
      • 2.Rc5#
    • 1...Rxh5
      • 2.Rd4#
    • 1...Se4
      • 2.Rd4#
    • 1...g4
      • 2.Sf4#
      • 2.Rd4#
  • Tries
    • 1.Sd2?
      • threat
        • 2.Rd4#
        • 2.Rc5#
      • 1...Qxa2
        • 2.Rc5#
        • 2.Qc5#
      • 1...Rxc4
        • 2.Rxd3#
      • 1...Sxc4
        • 2.Qxd8#
      • 1...e5
        • 2.Rd4#
      • 1...Rd4
        • 2.Rxd4#
        • 2.Rc5#
      • 1...Bf6!
    • 1.Sf4+?
      • 1...gxf4
        • 2.Rd4#
      • 1...Rxf4!
    • 1.Rxd3+?
      • 1...Rd4
        • 2.Rdxd4#
        • 2.Rcxd4#
      • 1...Kxc4!
  • Keys
    • 1.Re4!
      • threat
        • 2.Re5#
      • 1...Kxe4
        • 2.Sd2#
      • 1...Rxe4
        • 2.Rc5#
      • 1...Sxe4
        • 2.Sa5#
      • 1...e5
        • 2.Rxe5#
      • 1...Bf6
        • 2.Sxf6#
      • 1...Sc4
        • 2.Qxe6#
      • 1...Sf7
        • 2.Qxe6#

This anticipates 274283(1991)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 5
    • REMOVED MATES = 12
  • Sets
    • Q(g);N_GUARD::QAR1(H)
    • Q(g);N_GUARD,XB(A)::QAR1(H)
    • R(b);N_GUARD::R1(E)
    • R(b);N_GUARD::R1(E),XR(b)
    • R(b);SBLOCK::R1(E)
    • R(b);N_GUARD,XS(G)::R1(E)
    • S(e);S_CUTR(b)::R1(E)
  • Tries
    • Try
      • S(B);
      • Threat
        • DUALS(2)
      • Vars
        • R(b);N_GUARD,P_SPINR(b),XR(E)::R(C),XP(a)
        • S(e);OGATEB,P_SPINS(e),XR(E)::QAR(H),XB(i)
        • P(f);::B(A)+R(E),DCHECK
      • Refutation
        • B(i);
    • Try
      • S(G);CHECK
      • Vars
        • P(d);XS(G)::R1(E)
      • Refutation
        • R(b);XS(G)
    • Try
      • R(C);CHECK,XP(a)
      • Refutation
        • K(c);S_FLIGHT,XR(E)
  • Actual
    • R(E);
    • Threat
      • R1(E)
    • Vars
      • K(c);S_FLIGHT,XR(E)::S(B)
      • R(b);SBLOCK,XR(E)::R1(C)
      • S(e);N_GUARD,SBLOCK,XR(E)::B(A)+S(B)
      • P(f);::R1(E),XP(f)
      • B(i);N_GUARD::S(G),XB(i)
      • S(e);OGATE::QAB1(H),XP(f)
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).