MESON Chess Problem Database

Problem Display
PID: 71106 (Rn2b3/1P1kPp2/1PR1pP2/p3p3/B3K3/8/8/8 w - - 0 1)

Arnstam, Knut Anders Olof

Back, Par-Erik

Schackvarlden, 1943

Rn2b3/1P1kPp2/1PR1pP2/p3p3/B3K3/8/8/8

#2

8 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Sa6
      • 2.Rd8#
    • 1...Sxc6
      • 2.Rd8#
  • Tries
    • 1.Kd3?
      • 1...Sxc6
        • 2.Rd8#
      • 1...Sa6
        • 2.Rd8#
      • 1...e4+!
    • 1.Ke3?
      • 1...Sxc6
        • 2.Rd8#
      • 1...Sa6
        • 2.Rd8#
      • 1...e4!
    • 1.Kf3?
      • 1...Sxc6
        • 2.Rd8#
      • 1...Sa6
        • 2.Rd8#
      • 1...e4+!
    • 1.Bb5?
      • 1...Sxc6
        • 2.Rd8#
      • 1...Sa6
        • 2.Rd8#
      • 1...a4!
    • 1.Rc1+?
      • 1...Sc6
        • 2.Rd1#
        • 2.Rd8#
      • 1...Kd6!
    • 1.Rc2+?
      • 1...Sc6
        • 2.Rd2#
        • 2.Rd8#
      • 1...Kd6!
    • 1.Rc3+?
      • 1...Sc6
        • 2.Rd3#
        • 2.Rd8#
      • 1...Kd6!
    • 1.Rc4+?
      • 1...Sc6
        • 2.Rd8#
      • 1...Kd6!
    • 1.Rc5+?
      • 1...Sc6
        • 2.Rd8#
      • 1...Kd6!
    • 1.Rc8+?
      • 1...Sc6
        • 2.Rd8#
      • 1...Kd6!
  • Keys
    • 1.Ra7!
      • 1...Sxc6
        • 2.b8Q#
      • 1...Sa6
        • 2.b8S#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • S(f);OGATE::R1(H)
    • S(f);OGATE,P_SPINS(f),XR(D)::R1(H)
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Vars
        • S(f);OGATE,P_SPINS(f),XR(D)::R1(H)
        • S(f);OGATE::R1(H)
      • Refutation
        • P(b);CHECK
    • Try
      • K(B);P-FLIGHT
      • Vars
        • S(f);OGATE,P_SPINS(f),XR(D)::R1(H)
        • S(f);OGATE::R1(H)
      • Refutation
        • P(b);
    • Try
      • K(B);S_FLIGHT
      • Vars
        • S(f);OGATE,P_SPINS(f),XR(D)::R1(H)
        • S(f);OGATE::R1(H)
      • Refutation
        • P(b);CHECK
    • Try
      • B(A);
      • Vars
        • S(f);OGATE,P_SPINS(f),XR(D)::R1(H)
        • S(f);OGATE::R1(H)
      • Refutation
        • P(a);
    • Try
      • R(D);CHECK
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • R(D);CHECK
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • R(D);CHECK
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • R(D);CHECK
      • Vars
        • S(f);OGATE,P_SPINS(f)::R1(H)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • R(D);CHECK
      • Vars
        • S(f);OGATE,P_SPINS(f)::R1(H)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • R(D);CHECK
      • Vars
        • S(f);P_SPINS(f)::R1(D)
      • Refutation
        • K(d);P-FLIGHT
  • Actual
    • R(H);
    • Vars
      • S(f);OGATE,P_SPINS(f),XR(D)::P=Q
      • S(f);OGATE::P=S
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