MESON Chess Problem Database

Problem Display
PID: 63101 (5r2/p4r1p/2QP2P1/KN1q1P2/2p1k1B1/4P1BR/4P3/3N2b1 w - - 0 1)

Alaikov, Venelin

Petkov, Petko Andonov

1st Prize, Shakhmatna misl, 1971

5r2/p4r1p/2QP2P1/KN1q1P2/2p1k1B1/4P1BR/4P3/3N2b1

#2

12 + 8

3753 FIDE Album (1971-1973) 1978
133 The Problemist Supplement 2007
15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc6
      • 2.Sbc3#
    • 1...Bxe3
      • 2.Sc3#
  • Tries
    • 1.Ka4?
      • threat
        • 2.Sbc3#
      • 1...Bxe3
        • 2.Sdc3#
      • 1...c3
        • 2.Sbxc3#
      • 1...Qxc6!
    • 1.Ka6?
      • threat
        • 2.Sbc3#
      • 1...Bxe3
        • 2.Sdc3#
      • 1...c3
        • 2.Sbxc3#
      • 1...Qxc6+!
    • 1.Bh2?
      • threat
        • 2.Sc3#
      • 1...c3
        • 2.Sxc3#
      • 1...Bxh2!
    • 1.Bf4?
      • threat
        • 2.Sc3#
      • 1...c3
        • 2.Sxc3#
      • 1...Bxe3!
    • 1.Qxc4+?
      • 1...Qd4
        • 2.Sbc3#
        • 2.Qxd4#
      • 1...Qxc4!
  • Keys
    • 1.Rh4!
      • threat
        • 2.Bh3#
      • 1...Qxc6
        • 2.Sbc3#
      • 1...Rxf5
        • 2.Bf3#
      • 1...Bxe3
        • 2.Sc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • Q(d);N_PINS(H),N_SPINQ(d),XQ(J)::S(H)
    • B(a);SBLOCK,XP(C)::S(A)
  • Tries
    • Try
      • K(G);N_SPINS(H),P-FLIGHT
      • Threat
        • S(H)
      • Vars
        • B(a);SBLOCK,XP(C)::S(A)
        • P(b);::S(H),XP(b)
      • Refutation
        • Q(d);N_SPINQ(d),P_PINS(H),XQ(J)
    • Try
      • K(G);N_SPINS(H),P-FLIGHT
      • Threat
        • S(H)
      • Vars
        • B(a);SBLOCK,XP(C)::S(A)
        • P(b);::S(H),XP(b)
      • Refutation
        • Q(d);CHECK,N_SPINQ(d),XQ(J)
    • Try
      • B(D);
      • Threat
        • S(A)
      • Vars
        • P(b);::S(A),XP(b)
      • Refutation
        • B(a);XB(D)
    • Try
      • B(D);
      • Threat
        • S(A)
      • Vars
        • P(b);::S(A),XP(b)
      • Refutation
        • B(a);XP(C)
    • Try
      • Q(J);CHECK,N_PINQ(d),XP(b)
      • Refutation
        • Q(d);N_PINS(H),XQ(J)
  • Actual
    • R(E);
    • Threat
      • R(E)+B(F)
    • Vars
      • Q(d);N_PINS(H),N_SPINQ(d),XQ(J)::S(H)
      • R(f);SBLOCK,XP(I)::R(E)+B(F),DCHECK
      • B(a);SBLOCK,XP(C)::S(A)
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