MESON Chess Problem Database

Problem Display
PID: 217725 (6n1/4N3/4p3/2K1k3/4q1pB/8/Q7/1B6 w - - 0 1)

CW of Sunbury (Charles White)

English Mechanic and World of Science, 1873

(First published on Fri Jun 27 1873)

6n1/4N3/4p3/2K1k3/4q1pB/8/Q7/1B6

#2

5 + 5

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qh1
      • 2.Sg6#
    • 1...Qg2
      • 2.Sg6#
    • 1...Qf3
      • 2.Sg6#
    • 1...Qg6
      • 2.Sxg6#
    • 1...Qb7
      • 2.Sg6#
    • 1...Qa8
      • 2.Sg6#
    • 1...Qe1
      • 2.Sg6#
    • 1...Qe2
      • 2.Sg6#
    • 1...Qa4
      • 2.Sg6#
    • 1...Qf4
      • 2.Sc6#
      • 2.Sg6#
  • Tries
    • 1.Bg3+?
      • 1...Qf4
        • 2.Qa1#
        • 2.Qb2#
      • 1...Kf6!
    • 1.Qxe6+?
      • 1...Kf4
        • 2.Qxe4#
      • 1...Kxe6!
    • 1.Qa1+?
      • 1...Qd4+
        • 2.Qxd4#
      • 1...Kf4!
    • 1.Qb2+?
      • 1...Qd4+
        • 2.Qxd4#
      • 1...Kf4!
    • 1.Qh2+?
      • 1...Qf4
        • 2.Sc6#
        • 2.Sg6#
      • 1...g3!
  • Keys
    • 1.Qe2!
      • threat
        • 2.Qxe4#
      • 1...Qe3+
        • 2.Qxe3#
      • 1...Kf4
        • 2.Qxe4#
      • 1...Qxe2
        • 2.Sg6#
      • 1...Sf6
        • 2.Bg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 8
  • Sets
    • Q(a);N_GUARD::S(E)
    • Q(a);N_GUARD::S(E),XQ(a)
  • Tries
    • Try
      • B(C);CHECK
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(B);CHECK,XP(d)
      • Vars
        • K(c);OGATE,S_FLIGHT::QAR1(B),XQ(a)
      • Refutation
        • K(c);P-FLIGHT,XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • Q(a);CHECK,N_GUARD,P_SPINQ(a)::QAB1(B),XQ(a)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • Q(a);CHECK,N_GUARD,P_SPINQ(a)::QAB1(B),XQ(a)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Refutation
        • P(b);P_SPINP(b)
  • Actual
    • Q(B);P_PINQ(a)
    • Threat
      • QAR1(B),XQ(a)
    • Vars
      • Q(a);CHECK,OGATEB::QAR2(B),XQ(a)
      • K(c);N_SPINQ(a),S_FLIGHT::QAR1(B),XQ(a)
      • Q(a);N_SPINQ(a),XQ(B)::S(E)
      • S(e);SBLOCK::B(C)
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