MESON Chess Problem Database

Problem Display
PID: 211388 (1K6/N2p4/8/Qnkp3R/6NB/1Ppb2pB/8/3Rn3 w - - 0 1)

Hjelle, David

Land og Folk, 1971

1K6/N2p4/8/Qnkp3R/6NB/1Ppb2pB/8/3Rn3

#2

9 + 8

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Qb4#
    • 1...Kd6
      • 2.Qb6#
    • 1...Bb1
      • 2.Rdxd5#
      • 2.Rhxd5#
    • 1...Bf1
      • 2.Rdxd5#
      • 2.Rhxd5#
    • 1...Bc2
      • 2.Rdxd5#
      • 2.Rhxd5#
    • 1...Be2
      • 2.Rdxd5#
      • 2.Rhxd5#
    • 1...Bg6
      • 2.Rdxd5#
      • 2.Rhxd5#
    • 1...Bh7
      • 2.Rdxd5#
      • 2.Rhxd5#
  • Tries
    • 1.Be7+?
      • 1...Kd4
        • 2.Qb4#
        • 2.Qa4#
      • 1...d6!
    • 1.Rxd3?
      • threat
        • 2.Rdxd5#
        • 2.Rhxd5#
      • 1...Kd6
        • 2.Qb6#
      • 1...Sxd3!
    • 1.Qxb5+?
      • 1...Kd4
        • 2.Qb4#
        • 2.Qxd5#
      • 1...Kd6
        • 2.Qxd5#
        • 2.Qb6#
      • 1...Bxb5!
  • Keys
    • 1.Sf6!
      • threat
        • 2.Rxd5#
      • 1...Kd4
        • 2.Qb6#
      • 1...Kd6
        • 2.Qb4#
      • 1...Bc4
        • 2.Se4#
      • 1...Be4
        • 2.Sxe4#
      • 1...Bf5
        • 2.Rxd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(f);N_SPINP(g),N_SPINS(e),P_SPINB(c),S_FLIGHT::QAR2(F)
    • K(f);N_SPINP(g),N_SPINS(e),S_FLIGHT::QAR2(F)
  • Tries
    • Try
      • B(E);CHECK
      • Refutation
        • P(h);
    • Try
      • R(A);XB(c)
      • Threat
        • DUALS(2)
      • Vars
        • K(f);N_SPINS(e),S_FLIGHT::QAR2(F)
      • Refutation
        • S(a);XR(A)
    • Try
      • Q(F);CHECK,XS(e)
      • Refutation
        • B(c);XQ(F)
  • Actual
    • S(D);
    • Threat
      • R1(G),XP(g)
    • Vars
      • K(f);N_SPINP(g),N_SPINS(e),P_SPINB(c),S_FLIGHT::QAB(F)
      • K(f);N_SPINP(g),N_SPINS(e),S_FLIGHT::QAB(F)
      • B(c);N_GUARD::S(D)
      • B(c);N_GUARD::S(D),XB(c)
      • B(c);N_SPINP(g),OGATE::R1(A),XP(g)
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