MESON Chess Problem Database

Problem Display
PID: 12425 (3r4/1N1R1N2/3p4/3k4/3B4/3Q4/8/3R1K2 w - - 0 1)

Sydenham, Colin Peter

Die Schwalbe, 1979

3r4/1N1R1N2/3p4/3k4/3B4/3Q4/8/3R1K2

#2

7 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Ra8
      • 2.Rxd6#
    • 1...Rb8
      • 2.Rxd6#
    • 1...Rc8
      • 2.Rxd6#
    • 1...Re8
      • 2.Rxd6#
    • 1...Rf8
      • 2.Rxd6#
    • 1...Rg8
      • 2.Rxd6#
    • 1...Rh8
      • 2.Rxd6#
  • Tries
    • 1.Sa5?
      • threat
        • 2.Qf5#
      • 1...Re8
        • 2.Rxd6#
      • 1...Ke6!
    • 1.Sfxd6?
      • threat
        • 2.Qc4#
        • 2.Qe4#
      • 1...Kc6
        • 2.Qb5#
      • 1...Ke6
        • 2.Qf5#
      • 1...Rc8
        • 2.Qe4#
      • 1...Re8
        • 2.Qc4#
      • 1...Rf8+!
    • 1.Ba1+?
      • 1...Ke6
        • 2.Qh3#
      • 1...Kc6!
    • 1.Bb2+?
      • 1...Ke6
        • 2.Qh3#
      • 1...Kc6!
    • 1.Bc3+?
      • 1...Ke6
        • 2.Qh3#
      • 1...Kc6!
    • 1.Be5+?
      • 1...Ke6
        • 2.Qh3#
      • 1...Kc6!
    • 1.Bg7+?
      • 1...Ke6
        • 2.Qh3#
      • 1...Kc6!
    • 1.Bh8+?
      • 1...Ke6
        • 2.Qh3#
      • 1...Kc6!
    • 1.Rc7?
      • threat
        • 2.Qf5#
      • 1...Ke6
        • 2.Qe4#
      • 1...Re8!
    • 1.Re7?
      • threat
        • 2.Qb5#
      • 1...Kc6
        • 2.Qc4#
      • 1...Rc8!
    • 1.Qb5+?
      • 1...Ke6
        • 2.Sbxd8#
        • 2.Sg5#
        • 2.Sfxd8#
        • 2.Re1#
      • 1...Ke4!
    • 1.Qf5+?
      • 1...Kc6
        • 2.Sa5#
        • 2.Sbxd8#
        • 2.Sfxd8#
        • 2.Rc1#
      • 1...Kc4!
  • Keys
    • 1.Sbxd6!
      • threat
        • 2.Qc4#
        • 2.Qe4#
      • 1...Kc6
        • 2.Qb5#
      • 1...Ke6
        • 2.Qf5#
      • 1...Rc8
        • 2.Qe4#
      • 1...Re8
        • 2.Qc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • R(c);N_GUARD::R1(F),XP(b)
    • R(c);N_GUARD,P_PINS(G)::R1(F),XP(b)
  • Tries
    • Try
      • S(E);
      • Threat
        • QAR2(C)
      • Vars
        • R(c);N_GUARD::R1(F),XP(b)
      • Refutation
        • K(a);N_SPINP(b),S_FLIGHT
    • Try
      • S(G);XP(b)
      • Threat
        • DUALS(2)
      • Vars
        • K(a);S_FLIGHT::QAB1(C)
        • R(c);::QAB1(C)
      • Refutation
        • R(c);CHECK
    • Try
      • B(D);CHECK
      • Vars
        • K(a);N_SPINP(b),S_FLIGHT::QAB(C)
      • Refutation
        • K(a);N_SPINP(b),S_FLIGHT
    • Try
      • B(D);CHECK
      • Vars
        • K(a);N_SPINP(b),S_FLIGHT::QAB(C)
      • Refutation
        • K(a);N_SPINP(b),S_FLIGHT
    • Try
      • B(D);CHECK
      • Vars
        • K(a);N_SPINP(b),S_FLIGHT::QAB(C)
      • Refutation
        • K(a);N_SPINP(b),S_FLIGHT
    • Try
      • B(D);CHECK
      • Vars
        • K(a);N_SPINP(b),S_FLIGHT::QAB(C)
      • Refutation
        • K(a);N_SPINP(b),S_FLIGHT
    • Try
      • B(D);CHECK
      • Vars
        • K(a);N_SPINP(b),S_FLIGHT::QAB(C)
      • Refutation
        • K(a);N_SPINP(b),S_FLIGHT
    • Try
      • B(D);CHECK
      • Vars
        • K(a);N_SPINP(b),S_FLIGHT::QAB(C)
      • Refutation
        • K(a);N_SPINP(b),S_FLIGHT
    • Try
      • R(F);N_PINP(b)
      • Threat
        • QAR2(C)
      • Vars
        • K(a);S_FLIGHT::QAR2(C)
      • Refutation
        • R(c);
    • Try
      • R(F);N_PINP(b)
      • Threat
        • QAR2(C)
      • Vars
        • K(a);S_FLIGHT::QAR2(C)
      • Refutation
        • R(c);
    • Try
      • Q(C);CHECK
      • Refutation
        • K(a);N_SPINP(b),S_FLIGHT
    • Try
      • Q(C);CHECK
      • Refutation
        • K(a);N_SPINP(b),S_FLIGHT
  • Actual
    • S(E);XP(b)
    • Threat
      • DUALS(2)
    • Vars
      • K(a);S_FLIGHT::QAB1(C)
      • R(c);::QAB1(C)
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