MESON Chess Problem Database

Problem Display
PID: 15992 (8/P1P3K1/1p2NR2/2Pk2p1/1PNpp3/1Q2p2B/3n4/q2R2r1 w - - 0 1)

Pankratiev, Aleksandr Nikolaevich

Die Schwalbe, 2000

8/P1P3K1/1p2NR2/2Pk2p1/1PNpp3/1Q2p2B/3n4/q2R2r1

#2

11 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qb2
      • 2.a8Q#
      • 2.a8B#
    • 1...Qc3
      • 2.a8Q#
      • 2.a8B#
    • 1...Qb1
      • 2.a8Q#
      • 2.a8B#
    • 1...Qc1
      • 2.a8Q#
      • 2.a8B#
    • 1...Qxd1
      • 2.a8Q#
      • 2.a8B#
    • 1...g4
      • 2.Sf4#
  • Tries
    • 1.Sxd2+?
      • 1...Ke5
        • 2.Rf5#
      • 1...Kc6!
    • 1.Sxe3+?
      • 1...Ke5
        • 2.Rf5#
        • 2.Qd5#
      • 1...Kc6!
    • 1.Sxb6+?
      • 1...Ke5
        • 2.Sd7#
        • 2.Rf5#
        • 2.Qd5#
      • 1...Kc6!
    • 1.Sd8?
      • threat
        • 2.Be6#
        • 2.Rf5#
        • 2.Rd6#
      • 1...Sxb3
        • 2.Be6#
      • 1...Sxc4
        • 2.Rf5#
      • 1...Rf1
        • 2.Be6#
        • 2.Rd6#
      • 1...Rg4
        • 2.Rf5#
        • 2.Rd6#
      • 1...Sf3
        • 2.Be6#
        • 2.Rd6#
      • 1...g4
        • 2.Rf5#
        • 2.Rd6#
      • 1...d3!
    • 1.Rf5+?
      • 1...Kxe6
        • 2.Re5#
      • 1...Kc6!
  • Keys
    • 1.Sxd4!
      • threat
        • 2.Rd6#
      • 1...Kxd4
        • 2.Rd6#
      • 1...Qxd4
        • 2.a8Q#
        • 2.a8B#
      • 1...Sxb3
        • 2.Be6#
      • 1...Sxc4
        • 2.Rf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • Q(a);N_GUARD::P=Q
    • Q(a);N_GUARD,XR(A)::P=Q
    • P(h);N_GUARD::S(G)
  • Tries
    • Try
      • S(E);CHECK,XS(c)
      • Vars
        • K(g);P-FLIGHT::R1(H)
      • Refutation
        • K(g);S_FLIGHT
    • Try
      • S(E);CHECK,XP(d)
      • Refutation
        • K(g);S_FLIGHT
    • Try
      • S(E);CHECK,XP(i)
      • Refutation
        • K(g);S_FLIGHT
    • Try
      • S(G);
      • Threat
        • DUALS(3)
      • Vars
        • S(c);P_SPINP(e),XQ(B)::B(C)
        • S(c);P_SPINP(e),P_SPINS(c),XS(E)::R(H)
      • Refutation
        • P(e);P_PINR(H)
    • Try
      • R(H);CHECK
      • Vars
        • K(g);S_FLIGHT,XS(G)::B(C)+R(H),DCHECK
      • Refutation
        • K(g);S_FLIGHT
  • Actual
    • S(G);XP(e)
    • Threat
      • R1(H)
    • Vars
      • K(g);P-FLIGHT,P_SPINS(c),XS(G)::R(H)
      • Q(a);N_GUARD,P_PINR(H),SBLOCK,XS(G)::P=Q
      • S(c);XQ(B)::B(C)
      • S(c);P_SPINS(c),XS(E)::R(H)
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