MESON Chess Problem Database

Problem Display
PID: 84365 (Qb1N4/8/6NK/5kP1/R3n3/2nr3p/8/1B3rR1 w - - 0 1)

Brown, David Leo

British Chess Magazine, 1974

Qb1N4/8/6NK/5kP1/R3n3/2nr3p/8/1B3rR1

#2

8 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bd6
      • 2.Qc8#
    • 1...Sxb1
      • 2.Qxe4#
    • 1...Sd1
      • 2.Qxe4#
    • 1...Sa2
      • 2.Qxe4#
    • 1...Se2
      • 2.Qxe4#
    • 1...Sb5
      • 2.Qxe4#
    • 1...Sd6
      • 2.Rxf1#
  • Tries
    • 1.Qc6?
      • threat
        • 2.Qe6#
      • 1...Rxd8
        • 2.Qf6#
      • 1...Sxg5
        • 2.Rxg5#
      • 1...Bd6
        • 2.Qd7#
        • 2.Qc8#
      • 1...Sc5
        • 2.Qf6#
      • 1...Sd6
        • 2.Rxf1#
        • 2.Qd7#
      • 1...Rd6!
    • 1.Qxb8?
      • threat
        • 2.Sh4#
        • 2.Se7#
        • 2.Qe5#
      • 1...Rxg1
        • 2.Qf4#
      • 1...Rxd8
        • 2.Qe5#
      • 1...Sxg5
        • 2.Qe5#
      • 1...Rg3
        • 2.Qc8#
      • 1...Rd5
        • 2.Sh4#
        • 2.Se7#
      • 1...Rf4
        • 2.Se7#
        • 2.Qxf4#
        • 2.Qe5#
      • 1...Rd7
        • 2.Sh4#
        • 2.Qe5#
      • 1...Sd5
        • 2.Sh4#
        • 2.Qe5#
        • 2.Qc8#
      • 1...Sd6
        • 2.Rxf1#
      • 1...Rd6!
  • Keys
    • 1.Qa6!
      • threat
        • 2.Qe6#
      • 1...Rxd8
        • 2.Qf6#
      • 1...Sxg5
        • 2.Rxg5#
      • 1...Rd6
        • 2.Qxf1#
      • 1...Bd6
        • 2.Qc8#
      • 1...Sc5
        • 2.Qf6#
      • 1...Sd6
        • 2.Rxf1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • B(g);OGATE::QAB(G)
    • S(b);N_GUARD,XB(A)::QAB1(G),XS(e)
    • S(b);N_GUARD::QAB1(G),XS(e)
    • S(e);N_GUARD,P_SPINR(c),S_CUTB(g)::R(B),XR(a)
  • Tries
    • Try
      • Q(G);
      • Threat
        • QAB1(G)
      • Vars
        • R(c);P_SPINS(e),XS(H)::QAR1(G)
        • S(e);OGATE,P_SPINR(c),XP(D)::R1(B),XS(e)
        • S(e);N_GUARD,P_SPINR(c)::QAR1(G)
      • Refutation
        • R(c);P_PINS(E),P_SPINS(e)
    • Try
      • Q(G);XB(g)
      • Threat
        • DUALS(3)
      • Vars
        • R(a);N_GUARD,XR(B)::QAR1(G)
        • R(c);P_SPINS(e),XS(H)::QAR1(G)
        • S(e);P_SPINR(c),XP(D)::QAR1(G)
        • R(c);N_GUARD,P_SPINS(e)::QAB(G)
        • S(e);N_GUARD,P_SPINR(c)::R(B),XR(a)
      • Refutation
        • R(c);P_PINS(E),P_SPINS(e)
  • Actual
    • Q(G);
    • Threat
      • QAB1(G)
    • Vars
      • R(c);P_SPINS(e),XS(H)::QAR1(G)
      • S(e);OGATE,P_SPINR(c),XP(D)::R1(B),XS(e)
      • R(c);OGATE,P_PINS(E),P_SPINS(e)::QAR(G),XR(a)
      • B(g);S_CUTR(c)::QAB(G)
      • S(e);N_GUARD,P_SPINR(c)::QAR1(G)
      • S(e);N_GUARD,P_SPINR(c),S_CUTB(g)::R(B),XR(a)
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