MESON Chess Problem Database

Problem Display
PID: 274185 (R3K3/1k3BNQ/RP2pp2/7P/1N2r1p1/8/8/4n2q w - - 0 1)

Lider, Valentin Viktorovich

Mat, 1973

R3K3/1k3BNQ/RP2pp2/7P/1N2r1p1/8/8/4n2q

#2

9 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qf1
      • 2.Qxe4#
    • 1...Qg1
      • 2.Qxe4#
    • 1...Qh2
      • 2.Qxe4#
    • 1...Qh3
      • 2.Qxe4#
    • 1...Qh4
      • 2.Qxe4#
    • 1...Sg2
      • 2.Qxe4#
    • 1...Sf3
      • 2.Qxe4#
    • 1...e5
      • 2.Bd5#
  • Tries
    • 1.Sc6?
      • threat
        • 2.Sa5#
        • 2.Sd8#
      • 1...Qxh5
        • 2.Sd8#
      • 1...Ra4
        • 2.Sd8#
      • 1...Rd4
        • 2.Sa5#
      • 1...Re5
        • 2.Sd8#
      • 1...Kxc6!
  • Keys
    • 1.Sxe6!
      • threat
        • 2.Bg6#
        • 2.Bg8#
      • 1...Rxe6+
        • 2.Bxe6#
      • 1...Qxh5
        • 2.Bxh5#
      • 1...Rxb4
        • 2.Sd8#
      • 1...Qh2
        • 2.Qxe4#
      • 1...Rc4
        • 2.Sd8#
      • 1...Rd4
        • 2.Sc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 7
  • Sets
    • Q(b);N_GUARD::QAB(G),XR(c)
    • S(a);S_CUTQ(b)::QAB(G),XR(c)
    • P(e);OGATE::B(E)
  • Tries
    • Try
      • S(A);
      • Threat
        • DUALS(2)
      • Vars
        • Q(b);P_PINB(E),XP(B)::S(A)
        • R(c);::S(A)
      • Refutation
        • K(g);S_FLIGHT,XS(A)
  • Actual
    • S(F);P_SPINS(F),XP(e)
    • Threat
      • DUALS(2)
    • Vars
      • R(c);CHECK,OGATE,XS(F)::QAR(G)+B(E),XR(c)
      • Q(b);OGATE,P_PINB(E),XP(B)::QAR(G)+B(E),XQ(b)
      • R(c);N_PINS(F),XS(A)::S(F)
      • Q(b);N_GUARD::QAB(G),XR(c)
      • R(c);N_PINS(F)::S(F)
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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).