MESON Chess Problem Database

Problem Display
PID: 93137 (4n2q/8/1N1p4/5B2/1K1k4/Q3NpP1/4b3/3n4 w - - 0 1)

Ros, Johan August

Tidskrift for Schack, 1908

4n2q/8/1N1p4/5B2/1K1k4/Q3NpP1/4b3/3n4

#2

6 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qe5
      • 2.Sc2#
    • 1...Sb2
      • 2.Qc3#
    • 1...Sf2
      • 2.Qc3#
    • 1...Sc3
      • 2.Qxc3#
    • 1...Sxe3
      • 2.Qb2#
      • 2.Qa1#
      • 2.Qc3#
  • Tries
    • 1.Sxd1?
      • threat
        • 2.Qb2#
        • 2.Qa1#
        • 2.Qc3#
        • 2.Qe3#
      • 1...Bxd1
        • 2.Qc3#
      • 1...Qe5
        • 2.Qb2#
        • 2.Qa1#
        • 2.Qc3#
      • 1...Qh6
        • 2.Qb2#
        • 2.Qa1#
        • 2.Qc3#
      • 1...Bd3
        • 2.Qb2#
        • 2.Qa1#
        • 2.Qc3#
      • 1...Ke5!
    • 1.Qd3+?
      • 1...Ke5
        • 2.Sg4#
        • 2.Sd7#
      • 1...Bxd3!
  • Keys
    • 1.Qa7!
      • threat
        • 2.Sbc4#
        • 2.Sd7#
      • 1...Kxe3
        • 2.Sc4#
      • 1...Ke5
        • 2.Sd7#
      • 1...Sxe3
        • 2.Qa1#
      • 1...Qe5
        • 2.Sc2#
        • 2.Sbd5#
      • 1...Qg7
        • 2.Sd7#
      • 1...Qh7
        • 2.Sd7#
      • 1...Bc4
        • 2.Sbxc4#
        • 2.Sd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 4
  • Sets
    • Q(g);SBLOCK::S(B)
    • S(a);N_GUARD::QAB1(A)
    • S(a);N_GUARD::QAB1(A),XS(a)
  • Tries
    • Try
      • S(B);XS(a)
      • Threat
        • DUALS(4)
      • Vars
        • B(b);XS(B)::QAB1(A)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Refutation
        • B(b);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • DUALS(2)
    • Vars
      • K(d);S_FLIGHT,XS(B)::QAB(A)+S(F),DCHECK
      • K(d);S_FLIGHT::S(F)
      • S(a);N_GUARD,SBLOCK,XS(B)::QAB(A)
      • Q(g);::QAB(A)+S(F)
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