MESON Chess Problem Database

Problem Display
PID: 175123 (K7/4p3/NQ2p1N1/2PkP3/p7/p1Pn4/P3B3/8 w - - 0 1)

Jensen, W

320 Danske Skakopgaver, 1902

K7/4p3/NQ2p1N1/2PkP3/p7/p1Pn4/P3B3/8

#2

9 + 6

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sc1
      • 2.Qb7#
    • 1...Se1
      • 2.Qb7#
    • 1...Sb2
      • 2.Qb7#
    • 1...Sf2
      • 2.Qb7#
    • 1...Sf4
      • 2.Qb7#
  • Tries
    • 1.Sc7+?
      • 1...Kc4
        • 2.Qb4#
      • 1...Ke4!
    • 1.Qd8+?
      • 1...Kc4
        • 2.Qxd3#
      • 1...Ke4
        • 2.Qxd3#
      • 1...Kc6!
    • 1.Qb5?
      • threat
        • 2.Bf3#
      • 1...Ke4
        • 2.Qxd3#
      • 1...Se1
        • 2.Qb7#
      • 1...Sf2
        • 2.Qb7#
      • 1...Sxe5!
    • 1.Qd6+?
      • 1...Kc4
        • 2.Qxd3#
      • 1...Ke4
        • 2.Qxd3#
      • 1...exd6!
  • Keys
    • 1.Qb1!
      • 1...Kc4
        • 2.Qxd3#
      • 1...Ke4
        • 2.Qxd3#
      • 1...Kc6
        • 2.Qb7#
      • 1...Sxc5
        • 2.Sb4#
      • 1...Sxe5
        • 2.Sxe7#
      • 1...Sc1
        • 2.Qb7#
      • 1...Se1
        • 2.Qb7#
      • 1...Sb2
        • 2.Qh1#
      • 1...Sf2
        • 2.Qb7#
      • 1...Sb4
        • 2.Qh1#
      • 1...Sf4
        • 2.Qb7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • S(b);::QAB(G)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(d);P_SPINS(b),S_FLIGHT::QAR1(G)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • Q(G);CHECK
      • Vars
        • K(d);OGATE,P_SPINS(b),S_FLIGHT::QAB1(G),XS(b)
        • K(d);OGATE,S_FLIGHT::QAB1(G),XS(b)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • Q(G);
      • Threat
        • B(B)
      • Vars
        • K(d);S_FLIGHT::QAB1(G),XS(b)
        • S(b);::QAB(G)
      • Refutation
        • S(b);XP(E)
    • Try
      • Q(G);CHECK
      • Vars
        • K(d);OGATE,P_SPINS(b),S_FLIGHT::QAB1(G),XS(b)
        • K(d);OGATE,S_FLIGHT::QAB1(G),XS(b)
      • Refutation
        • P(f);XQ(G)
  • Actual
    • Q(G);
    • Vars
      • K(d);P_SPINS(b),S_FLIGHT::QAB1(G),XS(b)
      • K(d);S_FLIGHT::QAB1(G)
      • S(b);N_GUARD,SBLOCK,XP(D)::S(F)
      • S(b);SBLOCK,XP(E)::S(H),XP(f)
      • S(b);::QAB(G)
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