MESON Chess Problem Database

Problem Display
PID: 217298 (8/8/8/8/2p5/K5Qp/2pk3P/2N1N3 w - - 0 1)

CW of Sunbury (Charles White)

English Mechanic and World of Science, 1872

(First published on Fri Aug 23 1872)

8/8/8/8/2p5/K5Qp/2pk3P/2N1N3

#2

5 + 4

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Tries
    • 1.Sg2?
      • threat
        • 2.Qe1#
      • 1...Kxc1
        • 2.Qe1#
      • 1...Kd1
        • 2.Qe1#
      • 1...hxg2!
    • 1.Sf3+?
      • 1...Kxc1
        • 2.Qe1#
        • 2.Qg1#
      • 1...Kd1
        • 2.Qe1#
        • 2.Qg1#
      • 1...Kc3
        • 2.Qe1#
        • 2.Qe5#
        • 2.Qg7#
      • 1...Ke3!
    • 1.Qf2+?
      • 1...Kxc1
        • 2.Qxc2#
      • 1...Kc3
        • 2.Sa2#
        • 2.Qe3#
      • 1...Kd1!
    • 1.Qd3+?
      • 1...Kxc1
        • 2.Qxc2#
      • 1...Kxe1
        • 2.Qe2#
      • 1...cxd3!
  • Keys
    • 1.Qg1!
      • 1...Kxc1
        • 2.Sf3#
      • 1...Kd1
        • 2.Sf3#
      • 1...Kc3
        • 2.Qe3#
      • 1...c3
        • 2.Sf3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(B);
      • Threat
        • QAB1(E)
      • Vars
        • K(b);S_FLIGHT,XS(A)::QAR2(E)
        • K(b);P-FLIGHT::QAR1(E)
      • Refutation
        • P(c);XS(B)
    • Try
      • S(B);CHECK
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT,XS(A)::QAR1(E),XP(a)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(b);S_FLIGHT,XS(A)::QAR1(E),XP(a)
        • K(b);S_FLIGHT,XS(B)::QAR1(E)
      • Refutation
        • P(d);XQ(E)
  • Actual
    • Q(E);
    • Vars
      • K(b);S_FLIGHT,XS(A)::QAR(E)+S(B)
      • K(b);P-FLIGHT::QAR(E)+S(B)
      • K(b);S_FLIGHT::QAR2(E)
      • P(d);SBLOCK::S(B)
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