MESON Chess Problem Database

Problem Display
PID: 11336 (1Kn5/1R6/2k5/1N6/3PbNp1/5p2/1Q6/4b2B w - - 0 1)

Dugdale, CP

Chess, 1938

1Kn5/1R6/2k5/1N6/3PbNp1/5p2/1Q6/4b2B

#2

7 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Bf2
      • 2.Qc3#
    • 1...Bc3
      • 2.Qxc3#
    • 1...Bg3
      • 2.Qc3#
    • 1...Bh4
      • 2.Qc3#
    • 1...Sb6
      • 2.Rc7#
    • 1...Sd6
      • 2.Sa7#
    • 1...f2
      • 2.Bxe4#
  • Tries
    • 1.Sa7+?
      • 1...Sxa7
        • 2.Qb6#
      • 1...Kd6!
    • 1.Qc1+?
      • 1...Bc3
        • 2.Qxc3#
      • 1...Bc2!
    • 1.Qc2+?
      • 1...Bc3
        • 2.Qxe4#
        • 2.Qxc3#
      • 1...Bxc2!
    • 1.Qb3?
      • threat
        • 2.Qc4#
      • 1...Bd3
        • 2.Qd5#
      • 1...Bd5
        • 2.Qxd5#
      • 1...Sb6
        • 2.Rc7#
      • 1...Sd6
        • 2.Sa7#
      • 1...Bb4!
    • 1.Qb4?
      • threat
        • 2.Qc5#
        • 2.Qc4#
      • 1...Bd3
        • 2.Qc5#
        • 2.d5#
      • 1...Bd5
        • 2.Qc5#
      • 1...Sb6
        • 2.Sa7#
        • 2.Rc7#
        • 2.Qc5#
      • 1...Sd6
        • 2.Sa7#
        • 2.Qc5#
        • 2.Qxd6#
      • 1...Bxb4!
    • 1.d5+?
      • 1...Kc5
        • 2.Qd4#
      • 1...Bxd5!
  • Keys
    • 1.Qe2!
      • threat
        • 2.Qc4#
        • 2.Qxe4#
      • 1...fxe2
        • 2.Bxe4#
      • 1...Bb4
        • 2.Qxe4#
      • 1...Bb1
        • 2.Qc4#
        • 2.Qe8#
      • 1...Bc2
        • 2.Qc4#
        • 2.Qe8#
      • 1...Bd3
        • 2.Qe8#
      • 1...Bd5
        • 2.Qe8#
      • 1...Bf5
        • 2.Qc4#
      • 1...Bg6
        • 2.Qc4#
      • 1...Bh7
        • 2.Qc4#
        • 2.Qe8#
      • 1...Sb6
        • 2.Rc7#
      • 1...Sd6
        • 2.Sa7#
      • 1...Se7
        • 2.Qc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 5
  • Sets
    • B(a);N_GUARD::QAR(B)
    • B(a);N_GUARD::QAR(B),XB(a)
    • B(a);N_GUARD,P_PINS(D)::QAR(B)
    • S(f);SBLOCK::R1(F)
    • S(f);N_GUARD,SBLOCK::S(E)
    • P(b);OGATE,P_SPINB(c)::B(A),XB(c)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • S(f);XS(E)::QAR1(B)
      • Refutation
        • K(e);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::QAR(B),XB(a)
      • Refutation
        • B(c);P_SPINB(c),P_SPINP(b)
    • Try
      • Q(B);CHECK
      • Refutation
        • B(c);P_SPINP(b),XQ(B)
    • Try
      • Q(B);
      • Threat
        • QAR2(B)
      • Vars
        • B(c);N_GUARD,P_SPINP(b)::QAB1(B)
        • B(c);N_GUARD::QAB1(B),XB(c)
        • S(f);SBLOCK::R1(F)
        • S(f);N_GUARD,SBLOCK::S(E)
      • Refutation
        • B(a);
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • B(c);::QAR1(B)
      • Refutation
        • B(a);XQ(B)
    • Try
      • P(C);CHECK
      • Vars
        • K(e);P-FLIGHT::QAB1(B)
      • Refutation
        • B(c);XP(C)
  • Actual
    • Q(B);
    • Threat
      • DUALS(2)
    • Vars
      • P(b);OGATE,P_SPINB(c),XQ(B)::B(A),XB(c)
      • B(a);::QAB(B),XB(c)
      • B(c);OGATE,P_SPINP(b)::QAB(B)
      • B(c);OGATE::QAB(B)
      • B(c);P_SPINP(b)::QAR2(B)
      • S(f);SBLOCK::R1(F)
      • S(f);N_GUARD,SBLOCK::S(E)
      • S(f);::QAR2(B)
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