MESON Chess Problem Database

Problem Display
PID: 194059 (1B6/Q7/3Npp2/2q1k3/4P3/1P2n1PN/2P5/7K w - - 0 1)

Lundqvist, Folke

Nosb, 1917

1B6/Q7/3Npp2/2q1k3/4P3/1P2n1PN/2P5/7K

#2

9 + 5

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qb5
      • 2.Qa1#
    • 1...Sd1
      • 2.Qxc5#
    • 1...Sf1
      • 2.Qxc5#
    • 1...Sxc2
      • 2.Qxc5#
    • 1...Sg2
      • 2.Qxc5#
    • 1...Sc4
      • 2.Qxc5#
    • 1...Sg4
      • 2.Qxc5#
    • 1...Sf5
      • 2.Qxc5#
    • 1...f5
      • 2.Qg7#
  • Tries
    • 1.Sb5+?
      • 1...Qd6
        • 2.Qd4#
      • 1...Qc7
        • 2.Qd4#
      • 1...Kxe4!
    • 1.Sf5+?
      • 1...Qd6
        • 2.Qd4#
      • 1...Qc7
        • 2.Qd4#
      • 1...Kxe4!
    • 1.Qa1+?
      • 1...Qc3
        • 2.Qxc3#
      • 1...Qd4!
  • Keys
    • 1.Sg5!
      • threat
        • 2.Sf3#
      • 1...Kd4
        • 2.Sb5#
      • 1...Qxd6
        • 2.Qa1#
      • 1...fxg5
        • 2.Qg7#
      • 1...f5
        • 2.Qg7#
      • 1...Qc7
        • 2.Sdf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 8
  • Sets
    • Q(b);N_GUARD::QAB(H)
    • S(a);N_GUARD::QAR2(H),XQ(b)
    • S(a);N_GUARD,XP(B)::QAR2(H),XQ(b)
    • P(e);OGATEB::QAB(H)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • Q(b);OGATE,P_SPINQ(b)::QAB1(H)
      • Refutation
        • K(c);P-FLIGHT,XP(F)
    • Try
      • S(G);CHECK
      • Vars
        • Q(b);OGATE,P_SPINQ(b)::QAB1(H)
      • Refutation
        • K(c);P-FLIGHT,XP(F)
    • Try
      • Q(H);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::QAB(H),XQ(b)
      • Refutation
        • Q(b);P_SPINQ(b)
  • Actual
    • S(E);
    • Threat
      • S(E)
    • Vars
      • K(c);P_SPINQ(b),S_FLIGHT::S(G)
      • Q(b);N_GUARD,P_SPINQ(b),XS(G)::QAB(H)
      • P(e);OGATEB,XS(E)::QAB(H)
      • P(e);OGATEB::QAB(H)
      • Q(b);::S(G)
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