MESON Chess Problem Database

Problem Display
PID: 218760 (1B2bq2/8/K1RN3p/4P2p/1R1N2kr/3Q2pn/8/8 w - - 0 1)

Rudenko, Valentin Fedorovich

Deutsche Schachzeitung, 1958

1B2bq2/8/K1RN3p/4P2p/1R1N2kr/3Q2pn/8/8

#2

8 + 8

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kf4
      • 2.Sf3#
    • 1...Kg5
      • 2.Se6#
    • 1...Qxd6
      • 2.Qf5#
    • 1...Qe7
      • 2.Qf5#
    • 1...Qg7
      • 2.Qf5#
    • 1...Qf5
      • 2.Qxf5#
    • 1...Qg8
      • 2.Qf5#
    • 1...Qh8
      • 2.Qf5#
    • 1...Bf7
      • 2.Qf5#
  • Tries
    • 1.Se2+?
      • 1...Qf4
        • 2.Qxg3#
      • 1...Sf4
        • 2.Qxg3#
      • 1...Kg5!
    • 1.S4f5+?
      • 1...Sf4
        • 2.Qxg3#
      • 1...Kg5!
    • 1.Se6+?
      • 1...Qf4
        • 2.Qe2#
        • 2.Qd1#
      • 1...Sf4!
    • 1.Sf7?
      • threat
        • 2.Qf5#
        • 2.Qf3#
      • 1...Kf4
        • 2.Se2#
        • 2.Se6#
        • 2.Qf3#
      • 1...Bxc6
        • 2.Qf5#
      • 1...Bxf7
        • 2.Qf5#
      • 1...Sg1
        • 2.Qf5#
      • 1...Sf2
        • 2.Qf5#
      • 1...Sg5
        • 2.Qf5#
      • 1...Bd7
        • 2.Qf3#
      • 1...Sf4
        • 2.Qf5#
      • 1...g2
        • 2.Qf3#
      • 1...Qxf7!
  • Keys
    • 1.S6f5!
      • threat
        • 2.Qxg3#
      • 1...Kf4
        • 2.Se6#
      • 1...Kg5
        • 2.Sf3#
      • 1...Qxf5
        • 2.Qxf5#
      • 1...g2
        • 2.Qg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 6
  • Sets
    • K(c);P-FLIGHT::R(B)+S(C)
    • K(c);P-FLIGHT::S(C)
    • Q(h);N_GUARD,P_PINR(F),XS(G)::QAB1(A)
    • Q(h);N_GUARD::QAB1(A)
    • Q(h);N_GUARD::QAB1(A),XQ(h)
    • B(g);S_CUTQ(h)::QAB1(A)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • Q(h);P_SPINQ(h)::QAR1(A),XP(a)
        • S(b);P_SPINS(b)::QAR1(A),XP(a)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • S(C);CHECK
      • Vars
        • S(b);P_SPINS(b)::QAR1(A),XP(a)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • S(C);CHECK
      • Refutation
        • S(b);P_SPINS(b)
    • Try
      • S(G);
      • Threat
        • DUALS(2)
      • Vars
        • B(g);XR(F)::QAB1(A)
        • B(g);XS(G)::QAB1(A)
        • S(b);::QAB1(A)
        • B(g);::QAB1(A)
        • P(a);::QAB1(A)
      • Refutation
        • Q(h);XS(G)
  • Actual
    • S(G);
    • Threat
      • QAR1(A),XP(a)
    • Vars
      • K(c);P-FLIGHT::R(B)+S(C),DCHECK
      • K(c);P-FLIGHT::S(C)
      • Q(h);OGATE,XS(G)::QAB1(A),XQ(h)
      • P(a);::QAR1(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).