MESON Chess Problem Database

Problem Display
PID: 241433 (BK1Nn3/1N6/3p2p1/P1pk4/5Q2/4B3/1qrP4/8 w - - 0 1)

Hjelle, David

Parallele 50, 1951

BK1Nn3/1N6/3p2p1/P1pk4/5Q2/4B3/1qrP4/8

#2

8 + 7

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qa1
      • 2.Sxc5#
      • 2.Sxd6#
    • 1...Qc1
      • 2.Sxc5#
      • 2.Sxd6#
    • 1...Qa3
      • 2.Sxc5#
      • 2.Sxd6#
    • 1...Qc3
      • 2.Sxc5#
      • 2.Sxd6#
    • 1...Qd4
      • 2.Sxd6#
    • 1...Qe5
      • 2.Sxc5#
    • 1...Qf6
      • 2.Sxc5#
      • 2.Sxd6#
    • 1...Qh8
      • 2.Sxc5#
      • 2.Sxd6#
    • 1...Qa2
      • 2.Sxc5#
      • 2.Sxd6#
    • 1...Qxb7+
      • 2.Bxb7#
  • Tries
    • 1.Qf7+?
      • 1...Ke5
        • 2.Qe6#
      • 1...Ke4!
  • Keys
    • 1.d3!
      • threat
        • 2.Qe4#
      • 1...Qxb7+
        • 2.Bxb7#
      • 1...Qd4
        • 2.Sxd6#
      • 1...Qe5
        • 2.Sxc5#
      • 1...Qb4
        • 2.Qg5#
      • 1...Rc4
        • 2.dxc4#
      • 1...Sf6
        • 2.Qxd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • Q(a);N_PINS(E)::B(F)+S(E),XP(e)
    • Q(a);N_PINS(E)::B(F)+S(E),XP(c)
    • Q(a);CHECK,OGATE,P_SPINQ(a),XS(E)::B(F),XQ(a)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • K(d);P-FLIGHT::QAR1(C)
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • P(A);
    • Threat
      • QAB1(C)
    • Vars
      • Q(a);CHECK,OGATE,P_SPINQ(a),XS(E)::B(F),XQ(a)
      • Q(a);N_PINS(E)::B(F)+S(E),XP(e)
      • Q(a);N_PINS(E)::B(F)+S(E),XP(c)
      • Q(a);N_GUARD::QAR(C)
      • R(b);OGATE::P(A),XR(b)
      • S(g);N_GUARD::QAR1(C),XP(e)
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