MESON Chess Problem Database

Problem Display
PID: 11333 (4nb1r/1K2P1q1/3kB3/4NP2/P5p1/6B1/8/5Q2 w - - 0 1)

Dobbs, Gilbert S

Chess, 1938

4nb1r/1K2P1q1/3kB3/4NP2/P5p1/6B1/8/5Q2

#2

8 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe7+
      • 2.Sd7#
  • Tries
    • 1.Sc6+?
      • 1...Kc5
        • 2.Qc4#
        • 2.Qb5#
      • 1...Qe5!
    • 1.Sg6+?
      • 1...Kc5
        • 2.Qc4#
      • 1...Qe5!
    • 1.Sf7+?
      • 1...Kc5
        • 2.Qc4#
      • 1...Kxe7!
    • 1.Qc4?
      • threat
        • 2.Qb4#
      • 1...Qxe7+
        • 2.Sd7#
      • 1...Kxe7!
    • 1.Qb5?
      • threat
        • 2.Qb4#
      • 1...Qxe7+
        • 2.Sd7#
      • 1...Kxe7!
    • 1.Qa6+?
      • 1...Kc5
        • 2.Qb6#
      • 1...Kxe7!
    • 1.Qb1?
      • threat
        • 2.Qb4#
      • 1...Qxe7+
        • 2.Sd7#
      • 1...Kc5
        • 2.Qb6#
      • 1...Kxe7!
    • 1.Qc1?
      • threat
        • 2.Qa3#
      • 1...Qxe7+
        • 2.Sd7#
      • 1...Kxe7!
    • 1.Qf4?
      • threat
        • 2.Qb4#
      • 1...Qxe7+
        • 2.Sd7#
      • 1...Kc5
        • 2.Sd3#
        • 2.Sd7#
      • 1...Kxe7!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Qa3#
      • 1...Qxe7+
        • 2.Sd7#
      • 1...Kc5
        • 2.Sd3#
      • 1...Kxe7
        • 2.Sc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(c);CHECK,N_GUARD,SBLOCK,XP(H)::B(B)+S(D)
  • Tries
    • Try
      • S(D);CHECK
      • Refutation
        • Q(c);N_PINP(H),P_SPINQ(c)
    • Try
      • S(D);CHECK
      • Vars
        • K(b);S_FLIGHT::QAR1(A)
      • Refutation
        • Q(c);N_PINP(H),P_SPINQ(c)
    • Try
      • S(D);CHECK,N_SPINP(H)
      • Vars
        • K(b);S_FLIGHT::QAR1(A)
      • Refutation
        • K(b);S_FLIGHT,XP(H)
    • Try
      • Q(A);
      • Threat
        • QAB(A)
      • Vars
        • Q(c);CHECK,N_GUARD,SBLOCK,XP(H)::B(B)+S(D)
      • Refutation
        • K(b);S_FLIGHT,XP(H)
    • Try
      • Q(A);
      • Threat
        • QAB(A)
      • Vars
        • Q(c);CHECK,N_GUARD,SBLOCK,XP(H)::B(B)+S(D)
      • Refutation
        • K(b);S_FLIGHT,XP(H)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB1(A)
      • Refutation
        • K(b);S_FLIGHT,XP(H)
    • Try
      • Q(A);
      • Threat
        • QAB(A)
      • Vars
        • Q(c);CHECK,N_GUARD,SBLOCK,XP(H)::B(B)+S(D)
        • K(b);S_FLIGHT::QAB1(A)
      • Refutation
        • K(b);S_FLIGHT,XP(H)
    • Try
      • Q(A);
      • Threat
        • QAB(A)
      • Vars
        • Q(c);CHECK,N_GUARD,SBLOCK,XP(H)::B(B)+S(D)
      • Refutation
        • K(b);S_FLIGHT,XP(H)
    • Try
      • Q(A);
      • Threat
        • QAB(A)
      • Vars
        • Q(c);CHECK,N_GUARD,SBLOCK,XP(H)::QAB(A)+S(D)
      • Refutation
        • K(b);S_FLIGHT,XP(H)
  • Actual
    • Q(A);
    • Threat
      • QAB(A)
    • Vars
      • Q(c);CHECK,N_GUARD,SBLOCK,XP(H)::B(B)+S(D)
      • K(b);S_FLIGHT::S(D)
      • K(b);S_FLIGHT,XP(H)::S(D)
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