MESON Chess Problem Database

Problem Display
PID: 99180 (5RK1/8/4Rp1B/2prPN2/N1qPk3/3r2pB/4P3/1Q6 w - - 0 1)

Hjelle, David

Magyar Sakkelet, 1958

5RK1/8/4Rp1B/2prPN2/N1qPk3/3r2pB/4P3/1Q6

#2

11 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qa2
      • 2.Sc3#
      • 2.Qxd3#
    • 1...Qb5
      • 2.Sc3#
    • 1...Qa6
      • 2.Sc3#
    • 1...Qc1
      • 2.Qxd3#
    • 1...Qc3
      • 2.Sxc3#
    • 1...Qxa4
      • 2.Qxd3#
    • 1...Qb4
      • 2.Qxd3#
    • 1...Qxd4
      • 2.Sxg3#
    • 1...cxd4
      • 2.Sxg3#
    • 1...fxe5
      • 2.Bg2#
  • Tries
    • 1.Sxc5+?
      • 1...Qxc5
        • 2.Qxd3#
      • 1...Rxc5!
    • 1.Qh1+?
      • 1...Rf3
        • 2.Qxf3#
      • 1...g2!
    • 1.exd3+?
      • 1...Kf3
        • 2.Qf1#
      • 1...Qxd3!
  • Keys
    • 1.Qb7!
      • threat
        • 2.exf6#
      • 1...Qxd4
        • 2.Sd6#
      • 1...fxe5
        • 2.Rxe5#
      • 1...Qa6
        • 2.Sxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 0
    • REMOVED MATES = 6
  • Sets
    • Q(c);N_GUARD::S(D)
    • Q(c);N_GUARD::QAB1(A),XR(a)
    • Q(c);N_GUARD::S(D),XQ(c)
    • Q(c);N_GUARD,XS(D)::QAB1(A),XR(a)
    • Q(c);SBLOCK,XP(E)::S(G),XP(b)
    • P(e);SBLOCK,XP(E)::S(G),XP(b)
    • P(g);P_SPINP(g),XP(F)::B(C)
  • Tries
    • Try
      • S(D);CHECK,XP(e)
      • Vars
        • Q(c);XS(D)::QAB1(A),XR(a)
      • Refutation
        • R(f);P_PINR(H),XS(D)
    • Try
      • Q(A);CHECK,N_PINR(a)
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::QAB1(A),XR(a)
      • Refutation
        • P(b);P_SPINP(b)
    • Try
      • P(B);CHECK,XR(a)
      • Vars
        • K(d);S_FLIGHT::QAR2(A)
      • Refutation
        • Q(c);P_SPINQ(c),XP(B)
  • Actual
    • Q(A);N_PINR(a),P_PINR(f)
    • Threat
      • R(H)+P(F),XP(g)
    • Vars
      • Q(c);SBLOCK,XP(E)::S(G)
      • P(g);OGATE,P_SPINP(g),XP(F)::R1(H),XP(g)
      • Q(c);N_GUARD::S(D),XP(e)
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