MESON Chess Problem Database

Problem Display
PID: 9736 (5N2/6K1/3p4/4kpp1/1Q6/5P2/3rp3/6B1 w - - 0 1)

Bull, Cecil Alfred Lucas

Chess Amateur (The), 1909

5N2/6K1/3p4/4kpp1/1Q6/5P2/3rp3/6B1

#2

5 + 6

5454 Near Snap 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kd5
      • 2.Qb5#
    • 1...Ra2
      • 2.Qd4#
    • 1...Rb2
      • 2.Qd4#
    • 1...Rc2
      • 2.Qd4#
    • 1...Rd4
      • 2.Qxd4#
    • 1...f4
      • 2.Qe4#
    • 1...d5
      • 2.Qb8#
  • Tries
    • 1.Bh2+?
      • 1...f4
        • 2.Qe4#
      • 1...Kd5!
    • 1.Qc3+?
      • 1...Kf4
        • 2.Bh2#
      • 1...Rd4
        • 2.Qxd4#
      • 1...Kd5!
    • 1.Qc4?
      • threat
        • 2.Sg6#
        • 2.Sd7#
      • 1...Rd4
        • 2.Sg6#
        • 2.Qxd4#
      • 1...f4
        • 2.Qe6#
        • 2.Qe4#
      • 1...d5
        • 2.Qc7#
      • 1...Rd5!
  • Keys
    • 1.Qb3!
      • threat
        • 2.Sg6#
      • 1...Kf4
        • 2.Bh2#
      • 1...d5
        • 2.Qb8#
      • 1...Rd5
        • 2.Qe3#
      • 1...f4
        • 2.Qe6#

Anticipated by 224556(1888), 175199(1902)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • K(c);P-FLIGHT::QAR2(C)
    • R(a);N_GUARD::QAB1(C)
    • R(a);N_GUARD::QAB1(C),XR(a)
    • P(d);N_GUARD::QAR1(C)
    • P(f);OGATEB,SBLOCK::QAB(C)
  • Tries
    • Try
      • B(A);CHECK
      • Vars
        • P(d);P_SPINP(d)::QAR1(C)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(c);S_FLIGHT::B(A)
        • R(a);N_GUARD,P_SPINR(a)::QAB1(C),XR(a)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • P(f);OGATEB,SBLOCK::QAB(C)
      • Refutation
        • R(a);
  • Actual
    • Q(C);
    • Threat
      • S(E)
    • Vars
      • K(c);S_FLIGHT::B(A)
      • P(f);OGATEB,SBLOCK::QAB(C)
      • R(a);SBLOCK::QAR2(C)
      • P(d);SBLOCK::QAR1(C)
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