MESON Chess Problem Database

Problem Display
PID: 59601 (B5r1/2PP4/5p1b/1P1R4/1N2k3/p3NRpK/3nPpQ1/qb6 w - - 0 1)

Lobusov, Andrey Jakovlevic

1st Prize, Neue Zurcher Zeitung, 2002-2003

B5r1/2PP4/5p1b/1P1R4/1N2k3/p3NRpK/3nPpQ1/qb6

#2

11 + 10

56 The Problemist 2005
23 Die Schwalbe 2006
23 Die Schwalbe 2008
133 The Problemist Supplement 2010
23 Die Schwalbe 2011

SOLUTION

  • SOUND
  • Sets
    • 1...Bd3
      • 2.exd3#
    • 1...Sxf3
      • 2.Qxf3#
  • Tries
    • 1.Sd3?
      • threat
        • 2.Sc5#
      • 1...Bxd3
        • 2.exd3#
      • 1...Bxe3
        • 2.Rf4#
      • 1...Sxf3
        • 2.Qxf3#
      • 1...Qd4
        • 2.Re5#
      • 1...Bf8
        • 2.Rd6#
      • 1...Sb3
        • 2.Rxg3#
      • 1...Qc3!
    • 1.Rxf2+?
      • 1...Sf3
        • 2.Qxf3#
      • 1...Kxe3!
    • 1.Rxg3+?
      • 1...Sf3
        • 2.Qxf3#
      • 1...Kf4!
    • 1.Rff5+?
      • 1...Sf3
        • 2.Qxf3#
      • 1...Kxe3!
    • 1.Rxf6+?
      • 1...Sf3
        • 2.Qxf3#
      • 1...Kxe3!
  • Keys
    • 1.Sf5!
      • threat
        • 2.Sd6#
      • 1...Sxf3
        • 2.Qxf3#
      • 1...Qe5
        • 2.Rd4#
      • 1...Bf4
        • 2.Re3#
      • 1...Bf8
        • 2.Rc5#
      • 1...Sc4
        • 2.Rxf2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • B(b);OGATE::P(A),XB(b)
    • S(c);OGATE,P_SPINS(c),XR(D)::QAB1(B),XS(c)
  • Tries
    • Try
      • S(F);
      • Threat
        • S(F)
      • Vars
        • B(b);OGATE,XS(F)::P(A),XB(b)
        • B(i);SBLOCK,XS(C)::QAB(B)+R(D),DCHECK
        • S(c);OGATE,P_SPINS(c),XR(D)::QAB1(B),XS(c)
        • Q(a);SBLOCK::B(K)+R(H),DCHECK
        • B(i);S_CUTR(j)::B(K)+R(H)
        • S(c);N_GUARD::QAB(B)+R(D),XP(f)
      • Refutation
        • Q(a);
    • Try
      • R(D);CHECK,XP(d)
      • Vars
        • S(c);N_GUARD,P_SPINS(c)::QAB1(B),XS(c)
      • Refutation
        • K(g);P-FLIGHT,XS(C)
    • Try
      • R(D);CHECK,XP(f)
      • Vars
        • S(c);N_GUARD,P_SPINS(c)::QAB1(B),XS(c)
      • Refutation
        • K(g);P-FLIGHT
    • Try
      • R(D);CHECK
      • Vars
        • S(c);N_GUARD,P_SPINS(c)::QAB1(B),XS(c)
      • Refutation
        • K(g);P-FLIGHT,XS(C)
    • Try
      • R(D);CHECK,XP(h)
      • Vars
        • S(c);N_GUARD,P_SPINS(c)::QAB1(B),XS(c)
      • Refutation
        • K(g);P-FLIGHT,XS(C)
  • Actual
    • S(C);
    • Threat
      • S(C)
    • Vars
      • S(c);OGATE,P_SPINS(c),XR(D)::QAB1(B),XS(c)
      • Q(a);SBLOCK::B(K)+R(H),DCHECK
      • B(i);SBLOCK::QAB(B)+R(D),DCHECK
      • B(i);S_CUTR(j)::B(K)+R(H)
      • S(c);N_GUARD::QAB(B)+R(D),XP(d)
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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).