MESON Chess Problem Database

Problem Display
PID: 223372 (Q7/8/1p6/nkp5/8/7R/4N3/R3K3 w - - 0 1)

Watkinson, John

Baltimore American and Commercial Advertiser, 1885

Q7/8/1p6/nkp5/8/7R/4N3/R3K3

#2

5 + 4

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sb3
      • 2.Qa4#
    • 1...Sc4
      • 2.Rb3#
      • 2.Qa4#
    • 1...Sc6
      • 2.Qa4#
    • 1...Sb7
      • 2.Qa4#
  • Tries
    • 1.Rh4?
      • threat
        • 2.Sc3#
      • 1...Sc4
        • 2.Qa4#
      • 1...Sb7
        • 2.Qa4#
        • 2.Qe8#
      • 1...c4!
  • Keys
    • 1.Rb3+!
      • 1...Kc4
        • 2.Qg8#
      • 1...Sxb3
        • 2.Qa4#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • S(a);OGATE::QAB1(E)
    • S(a);OGATE,SBLOCK::QAB1(E)
  • Tries
    • Try
      • R(D);
      • Threat
        • S(C)
      • Vars
        • S(a);OGATE::QAB1(E)
      • Refutation
        • P(c);
  • Actual
    • R(D);CHECK
    • Vars
      • K(b);S_FLIGHT::QAB(E)
      • S(a);OGATE,XR(D)::QAB1(E)
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