MESON Chess Problem Database

Problem Display
PID: 9717 (8/2N1qN2/B4PP1/brn1B2K/2k1P2R/Q2pP3/PrpP4/8 w - - 0 1)

Gavrilov, Constantin Grigorievich

Tidskrift for Schack, 1908

8/2N1qN2/B4PP1/brn1B2K/2k1P2R/Q2pP3/PrpP4/8

#2

13 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qd6
      • 2.Sxd6#
    • 1...Qxe5+
      • 2.Sxe5#
    • 1...Qe8
      • 2.Sd6#
    • 1...Rxa2
      • 2.Bxb5#
    • 1...Rb4
      • 2.Qc3#
    • 1...Bc3
      • 2.Qxc3#
    • 1...Bb4
      • 2.Bxb5#
    • 1...Bb6
      • 2.Qc3#
    • 1...Bxc7
      • 2.Qc3#
    • 1...Sb3
      • 2.Bxb5#
    • 1...Sxe4
      • 2.Rxe4#
  • Tries
    • 1.Bxb2?
      • threat
        • 2.Bxb5#
      • 1...Qe5+
        • 2.Sxe5#
      • 1...Sxa6+
        • 2.e5#
      • 1...Bxc7
        • 2.Qc3#
      • 1...Qd7
        • 2.Se5#
      • 1...Qe8
        • 2.Sd6#
      • 1...Qxc7!
    • 1.Qa4+?
      • 1...Rb4
        • 2.Bxb5#
      • 1...Bb4
        • 2.Bxb5#
        • 2.Qxb5#
      • 1...Sxa4!
    • 1.fxe7?
      • threat
        • 2.Sd6#
      • 1...Bxc7
        • 2.Qc3#
      • 1...Sb7!
  • Keys
    • 1.Bd6!
      • threat
        • 2.Qxc5#
      • 1...Qe5+
        • 2.Sxe5#
      • 1...Sb3+
        • 2.Bxb5#
      • 1...Sa4+
        • 2.e5#
      • 1...Sxe4+
        • 2.Qc5#
      • 1...Sxa6+
        • 2.e5#
      • 1...Se6+
        • 2.Se5#
      • 1...Sb7+
        • 2.e5#
      • 1...Sd7+
        • 2.e5#
      • 1...Qxd6
        • 2.Sxd6#
      • 1...Qxc7
        • 2.Se5#
      • 1...Rxa2
        • 2.Bxb5#
      • 1...Rb4
        • 2.Qc3#
      • 1...Bb4
        • 2.Bxb5#
      • 1...Bb6
        • 2.Qc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 3
  • Sets
    • Q(h);N_GUARD::S(M),XQ(h)
    • Q(h);CHECK,XB(G)::S(M),XQ(h)
    • Q(h);N_GUARD::S(M)
    • R(a);N_GUARD,XP(A)::B(I),XR(f)
    • R(a);S_CUTB(e)::QAR1(C)
    • B(e);N_GUARD::QAR1(C),XB(e)
    • B(e);S_CUTR(a)::B(I),XR(f)
    • B(e);N_GUARD::QAR1(C)
    • B(e);N_GUARD,XS(L)::QAR1(C)
    • S(g);P_PINB(G),S_CUTR(a)::B(I),XR(f)
    • S(g);OGATE,P_PINB(G),P_SPINS(g),XP(E)::R(F),XS(g)
  • Tries
    • Try
      • B(G);XR(a)
      • Threat
        • B(I),XR(f)
      • Vars
        • Q(h);CHECK,N_GUARD::S(M),XQ(h)
        • S(g);CHECK,N_GUARD,N_SPINR(f),XB(I)::R(F)+P(E)
        • B(e);N_GUARD,XS(L)::QAR1(C)
        • Q(h);N_GUARD::S(M)
      • Refutation
        • Q(h);XS(L)
    • Try
      • Q(C);CHECK
      • Vars
        • R(a);N_SPINR(f),P_SPINR(a)::B(I),XR(f)
      • Refutation
        • S(g);P_PINB(G),XQ(C)
    • Try
      • P(J);XQ(h)
      • Threat
        • S(M)
      • Vars
        • B(e);N_GUARD,XS(L)::QAR1(C)
      • Refutation
        • S(g);P_PINB(G)
  • Actual
    • B(G);
    • Threat
      • QAR1(C),XS(g)
    • Vars
      • Q(h);CHECK,N_GUARD::S(M),XQ(h)
      • S(g);CHECK,S_CUTR(a)::B(I),XR(f)
      • S(g);CHECK,N_GUARD::R(F)+P(E)
      • S(g);CHECK,P_SPINS(g),XP(E)::QAR1(C)
      • S(g);CHECK,N_GUARD,N_SPINR(f),XB(I)::R(F)+P(E)
      • S(g);CHECK,S_CUTQ(h)::S(M)
      • Q(h);XB(G)::S(M),XQ(h)
      • Q(h);N_GUARD,XS(L)::S(M)
      • R(a);N_GUARD,XP(A)::B(I),XR(f)
      • R(a);S_CUTB(e)::QAR1(C)
      • B(e);S_CUTR(a)::B(I),XR(f)
      • B(e);N_GUARD::QAR1(C)
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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).