MESON Chess Problem Database

Problem Display
PID: 199310 (1q6/rN6/rPPp1Rp1/pk3bR1/p4p2/P1K2B2/4PQ1b/6B1 w - - 0 1)

Hjelle, David

Springaren, 1955

1q6/rN6/rPPp1Rp1/pk3bR1/p4p2/P1K2B2/4PQ1b/6B1

#2

11 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qa8
      • 2.Sxd6#
    • 1...Qc8
      • 2.Sxd6#
    • 1...Qe8
      • 2.Sxd6#
    • 1...Qg8
      • 2.Sxd6#
    • 1...Qh8
      • 2.Sxd6#
    • 1...Rxb6
      • 2.Qxb6#
    • 1...d5
      • 2.Qc5#
  • Tries
    • 1.Rgxf5+?
      • 1...d5
        • 2.Rxd5#
        • 2.Qc5#
      • 1...gxf5!
    • 1.Rfxf5+?
      • 1...d5
        • 2.Qc5#
      • 1...gxf5!
    • 1.Qd4?
      • threat
        • 2.Qd3#
        • 2.Qc4#
        • 2.Qd5#
      • 1...Rxb6
        • 2.Qxb6#
        • 2.Qd3#
        • 2.Qc4#
      • 1...Qg8
        • 2.Sxd6#
      • 1...d5
        • 2.Qc5#
        • 2.Qxd5#
      • 1...Bxg1!
  • Keys
    • 1.Qf1!
      • threat
        • 2.Qb1#
      • 1...Rxb6
        • 2.e3#
      • 1...Qg8
        • 2.Sxd6#
      • 1...d5
        • 2.e4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 4
  • Sets
    • Q(k);N_GUARD::S(K),XP(h)
    • Q(k);N_GUARD,P_PINP(I)::S(K),XP(h)
    • Q(k);N_GUARD,P_PINR(J)::S(K),XP(h)
    • R(g);OGATE,XP(H)::QAR1(C),XR(g)
    • P(h);N_GUARD,N_SPINB(f)::QAR1(C)
  • Tries
    • Try
      • R(G);CHECK,XB(f)
      • Refutation
        • P(i);XR(G)
    • Try
      • R(J);CHECK,XB(f)
      • Vars
        • P(h);N_GUARD,P_SPINP(h)::QAR1(C)
      • Refutation
        • P(i);P_SPINP(i),XR(J)
    • Try
      • Q(C);
      • Threat
        • DUALS(3)
      • Vars
        • Q(k);N_GUARD::S(K),XP(h)
      • Refutation
        • B(a);XB(A)
  • Actual
    • Q(C);
    • Threat
      • QAR(C)
    • Vars
      • R(g);SBLOCK,XP(H)::QAB(C)+P(B)
      • Q(k);N_GUARD::S(K),XP(h)
      • P(h);N_SPINB(f)::QAB(C)+P(B)
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