MESON Chess Problem Database

Problem Display
PID: 183989 (4B2K/4p1p1/8/4PkN1/2p2P2/2P2Q1p/7B/6qn w - - 0 1)

Anderson, F

British Chess Magazine, 1915

4B2K/4p1p1/8/4PkN1/2p2P2/2P2Q1p/7B/6qn

#2

8 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qf2
      • 2.Qxh3#
    • 1...Qd4
      • 2.Qxh3#
    • 1...Qc5
      • 2.Qxh3#
    • 1...Qb6
      • 2.Qxh3#
    • 1...Qa7
      • 2.Qxh3#
    • 1...Qa1
      • 2.Qxh3#
    • 1...Qb1
      • 2.Qxh3#
    • 1...Qc1
      • 2.Qxh3#
    • 1...Qe1
      • 2.Qxh3#
    • 1...Qg4
      • 2.Qe4#
  • Tries
    • 1.Kxg7?
      • threat
        • 2.Bg6#
      • 1...Qb6
        • 2.Qxh3#
      • 1...Qxg5+!
    • 1.Kh7?
      • threat
        • 2.Bg6#
      • 1...Qb6
        • 2.Qxh3#
      • 1...g6
        • 2.Bxg6#
      • 1...Qxg5!
    • 1.Qd3+?
      • 1...Kg4
        • 2.Qxh3#
      • 1...cxd3!
  • Keys
    • 1.Se6!
      • 1...Kxe6
        • 2.f5#
      • 1...Qxh2
        • 2.Sd4#
        • 2.Sxg7#
      • 1...Qf2
        • 2.Sxg7#
      • 1...Qe3
        • 2.Sxg7#
      • 1...Qd4
        • 2.Sxd4#
        • 2.Sxg7#
      • 1...Qc5
        • 2.Sxg7#
      • 1...Qb6
        • 2.Sxg7#
      • 1...Qa7
        • 2.Sxg7#
      • 1...Qa1
        • 2.Sd4#
        • 2.Sxg7#
      • 1...Qb1
        • 2.Sd4#
        • 2.Sxg7#
      • 1...Qc1
        • 2.Sd4#
        • 2.Sxg7#
      • 1...Qd1
        • 2.Sxg7#
      • 1...Qe1
        • 2.Sd4#
        • 2.Sxg7#
      • 1...Qf1
        • 2.Sd4#
        • 2.Sxg7#
      • 1...Qg2
        • 2.Sd4#
      • 1...Qg3
        • 2.Sd4#
      • 1...Qg4
        • 2.Sd4#
      • 1...Qg5
        • 2.Sd4#
      • 1...Qg6
        • 2.Sd4#
      • 1...Sf2
        • 2.Sd4#
      • 1...Sg3
        • 2.Sxg7#
      • 1...g5
        • 2.Sg7#
      • 1...g6
        • 2.Sg7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 5
    • ADDED MATES = 11
    • REMOVED MATES = 5
  • Sets
    • Q(a);N_GUARD::QAB(C),XP(c)
    • Q(a);SBLOCK::QAB1(C)
  • Tries
    • Try
      • K(H);P_SPINS(F),S_FLIGHT,XP(g)
      • Threat
        • B(G)
      • Vars
        • Q(a);N_GUARD,N_PINS(F)::QAB(C),XP(c)
      • Refutation
        • Q(a);CHECK,XS(F)
    • Try
      • K(H);P-FLIGHT
      • Threat
        • B(G)
      • Vars
        • Q(a);N_GUARD::QAB(C),XP(c)
        • P(g);::B(G),XP(g)
      • Refutation
        • Q(a);XS(F)
    • Try
      • Q(C);CHECK
      • Vars
        • K(e);S_FLIGHT::QAB1(C),XP(c)
      • Refutation
        • P(d);XQ(C)
  • Actual
    • S(F);
    • Vars
      • K(e);OGATE,S_FLIGHT,XS(F)::P(D)
      • Q(a);N_GUARD::S(F),XP(g)
      • Q(a);N_GUARD::S(F)
      • S(b);S_CUTQ(a)::S(F)
      • S(b);S_CUTQ(a)::S(F),XP(g)
      • P(g);S_CUTQ(a)::S(F)
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