MESON Chess Problem Database

Problem Display
PID: 122235 (3R3N/5npk/8/K7/3p4/8/B7/2Q5 w - - 0 1)

Scheel, Johan

Delnicke listy, 1912

3R3N/5npk/8/K7/3p4/8/B7/2Q5

#2

5 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Se5
      • 2.Qh1#
    • 1...Sd6
      • 2.Qh1#
    • 1...Sxd8
      • 2.Qh1#
  • Tries
    • 1.Qg5?
      • threat
        • 2.Qg6#
      • 1...Sxd8
        • 2.Qh4#
        • 2.Qh5#
      • 1...Sxh8
        • 2.Bg8#
        • 2.Qh5#
      • 1...g6
        • 2.Qxg6#
      • 1...Se5
        • 2.Qh4#
        • 2.Qh5#
      • 1...Sxg5!
    • 1.Qb1+?
      • 1...Kh6
        • 2.Qg6#
      • 1...g6
        • 2.Qxg6#
      • 1...d3!
    • 1.Qc2+?
      • 1...Kh6
        • 2.Qg6#
      • 1...g6
        • 2.Qxg6#
      • 1...d3!
  • Keys
    • 1.Qc6!
      • threat
        • 2.Qg6#
      • 1...Sxd8
        • 2.Qh1#
      • 1...Sxh8
        • 2.Bg8#
      • 1...Sd6
        • 2.Qh1#
      • 1...g6
        • 2.Qxg6#
      • 1...Se5
        • 2.Qh1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(b);N_GUARD::QAR(A)
    • S(b);N_GUARD,XR(D)::QAR(A)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • P(c);::QAB1(A),XP(c)
      • Refutation
        • S(b);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(d);P-FLIGHT::QAR1(A)
        • P(c);P_SPINP(c)::QAB1(A),XP(c)
      • Refutation
        • P(a);P_SPINP(a)
    • Try
      • Q(A);CHECK
      • Vars
        • K(d);P-FLIGHT::QAR1(A)
        • P(c);P_SPINP(c)::QAB1(A),XP(c)
      • Refutation
        • P(a);P_SPINP(a)
  • Actual
    • Q(A);
    • Threat
      • QAB1(A)
    • Vars
      • S(b);N_GUARD,XR(D)::QAR(A)
      • S(b);OGATE,SBLOCK,XS(E)::B(B)
      • S(b);N_GUARD::QAR(A)
      • P(c);::QAB1(A),XP(c)
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