MESON Chess Problem Database

Problem Display
PID: 182365 (4N3/1Q4n1/3pp3/3p2K1/r3k3/q3pN2/1bP1B3/8 w - - 0 1)

Gold, Samuel

Lasker's Chess Magazine, 1906

4N3/1Q4n1/3pp3/3p2K1/r3k3/q3pN2/1bP1B3/8

#2

6 + 9

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qa1
      • 2.Sxd6#
    • 1...Qa2
      • 2.Sxd6#
    • 1...Qb3
      • 2.Sxd6#
    • 1...Qc3
      • 2.Sxd6#
    • 1...Qd3
      • 2.Sxd6#
      • 2.cxd3#
    • 1...Rb4
      • 2.Sxd6#
    • 1...Rd4
      • 2.Sf6#
    • 1...Bc1
      • 2.Sf6#
    • 1...Bf6+
      • 2.Sxf6#
    • 1...Sh5
      • 2.Qh7#
    • 1...Sxe8
      • 2.Qh7#
    • 1...e5
      • 2.Sf6#
  • Tries
    • 1.Qb4+?
      • 1...Rxb4
        • 2.Sxd6#
      • 1...Bd4
        • 2.Sxd6#
        • 2.Sf6#
      • 1...d4
        • 2.Sf6#
      • 1...Qxb4!
    • 1.Qxg7?
      • threat
        • 2.Qg6#
        • 2.Qh7#
      • 1...Bf6+
        • 2.Sxf6#
      • 1...d4
        • 2.Sf6#
      • 1...Ra7
        • 2.Qg6#
      • 1...Bxg7!
  • Keys
    • 1.c3!
      • threat
        • 2.Sf6#
      • 1...Qxc3
        • 2.Sxd6#
      • 1...Bxc3
        • 2.Qb1#
      • 1...Sxe8
        • 2.Qh7#
      • 1...Sh5
        • 2.Qh7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 8
  • Sets
    • Q(b);N_GUARD::S(F),XP(g)
    • R(d);S_CUTQ(b)::S(F),XP(g)
    • R(d);S_CUTB(a)::S(F)
    • B(a);N_GUARD::S(F)
    • B(a);CHECK,N_GUARD::S(F),XB(a)
    • S(i);OGATE::QAB(E)
    • S(i);OGATE,XS(F)::QAB(E)
    • P(h);S_CUTB(a)::S(F)
  • Tries
    • Try
      • Q(E);CHECK,N_PINP(f)
      • Vars
        • R(d);XQ(E)::S(F),XP(g)
        • P(f);P_SPINP(f)::S(F)
      • Refutation
        • Q(b);XQ(E)
    • Try
      • Q(E);N_PINP(f),XS(i)
      • Threat
        • DUALS(2)
      • Vars
        • B(a);CHECK,N_GUARD::S(F),XB(a)
        • P(f);S_CUTB(a)::S(F)
        • R(d);::QAB(E)
      • Refutation
        • B(a);XQ(E)
  • Actual
    • P(A);
    • Threat
      • S(F)
    • Vars
      • Q(b);N_GUARD,XP(A)::S(F),XP(g)
      • B(a);OGATE,XP(A)::QAB(E)
      • S(i);OGATE,XS(F)::QAB(E)
      • S(i);OGATE::QAB(E)
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