MESON Chess Problem Database

Problem Display
PID: 199871 (r1B1q3/1P2p1N1/Qp2b3/2n3R1/R3pkPP/6p1/1rn3P1/B2Nb2K w - - 0 1)

Servais, Albert

1st Prize, FBE, 1937

r1B1q3/1P2p1N1/Qp2b3/2n3R1/R3pkPP/6p1/1rn3P1/B2Nb2K

#2

12 + 12

5110 Bekroonde Problemen 2002

SOLUTION

  • SOUND
  • Sets
    • 1...Qxa4
      • 2.Sh5#
    • 1...Qb5
      • 2.Sh5#
    • 1...Qh5
      • 2.Sxh5#
    • 1...Qc6
      • 2.Sh5#
    • 1...Qd7
      • 2.Sh5#
    • 1...Qxc8
      • 2.Sh5#
    • 1...Qd8
      • 2.Sh5#
    • 1...Qf8
      • 2.Sh5#
    • 1...Qg8
      • 2.Sh5#
    • 1...Rb1
      • 2.Be5#
    • 1...Ra2
      • 2.Be5#
    • 1...Rb3
      • 2.Be5#
    • 1...Rb4
      • 2.Be5#
    • 1...Rb5
      • 2.Be5#
    • 1...Rxa6
      • 2.b8Q#
      • 2.b8B#
    • 1...Bd2
      • 2.Qf1#
    • 1...Bc3
      • 2.Qf1#
    • 1...Bb4
      • 2.Qf1#
    • 1...Ba5
      • 2.Qf1#
    • 1...Sb3
      • 2.Sxe6#
    • 1...Sd3
      • 2.Sxe6#
    • 1...Sxa4
      • 2.Sxe6#
    • 1...Sxa6
      • 2.Sxe6#
    • 1...Sxb7
      • 2.Sxe6#
    • 1...Sd7
      • 2.Sxe6#
  • Tries
    • 1.Rxe4+?
      • 1...Sxe4
        • 2.Sxe6#
      • 1...Kxe4!
  • Keys
    • 1.Qe2!
      • threat
        • 2.Qf3#
      • 1...Qxa4
        • 2.Sh5#
      • 1...Rxa4
        • 2.b8Q#
        • 2.b8B#
      • 1...Bxg4
        • 2.Qxg4#
      • 1...Sxa4
        • 2.Sxe6#
      • 1...Bf5
        • 2.Rxf5#
      • 1...Rb3
        • 2.Be5#
      • 1...Rb4
        • 2.Be5#
      • 1...Bb4
        • 2.Qf1#
      • 1...Bc4
        • 2.Rf5#
      • 1...Sb4
        • 2.Qe3#
      • 1...Sd4
        • 2.Qe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 19
  • Sets
    • Q(l);N_GUARD,N_SPINP(e),XR(E)::S(K)
    • Q(l);N_GUARD::S(K)
    • Q(l);N_GUARD,P_PINP(G)::S(K),XQ(l)
    • Q(l);N_GUARD,XB(L)::S(K)
    • R(b);OGATE::B(A)
    • R(b);N_SPINP(e),OGATE::B(A)
    • R(k);N_GUARD,XQ(I)::P=Q
    • B(a);N_GUARD::QAR(I)
    • B(a);N_GUARD,N_SPINP(e)::QAR(I)
    • S(g);N_GUARD::S(K),XB(i)
    • S(g);N_GUARD,N_SPINP(e),XR(E)::S(K),XB(i)
    • S(g);N_GUARD,XQ(I)::S(K),XB(i)
    • S(g);N_GUARD,XP(J)::S(K),XB(i)
  • Tries
    • Try
      • R(E);CHECK,XP(e)
      • Vars
        • S(g);SBLOCK,XR(E)::S(K),XB(i)
      • Refutation
        • K(f);P-FLIGHT,XR(E)
  • Actual
    • Q(I);
    • Threat
      • QAR1(I)
    • Vars
      • Q(l);N_GUARD,N_SPINP(e),XR(E)::S(K)
      • R(k);N_GUARD,N_SPINP(e),XR(E)::P=Q
      • B(i);OGATE,XP(F)::QAR1(I),XB(i)
      • S(g);N_GUARD,N_SPINP(e),XR(E)::S(K),XB(i)
      • B(i);N_GUARD::R1(H),XB(i)
      • R(b);OGATE::B(A)
      • R(b);N_SPINP(e),OGATE::B(A)
      • B(a);N_GUARD,N_SPINP(e)::QAR(I)
      • B(i);N_GUARD,N_SPINP(e)::R1(H)
      • S(c);N_GUARD,N_SPINP(e)::QAB1(I)
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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).