MESON Chess Problem Database

Problem Display
PID: 174499 (5n2/PnQp3B/1P2pp2/2PkN3/R1r1R3/2P5/2Kp1q1B/3N4 w - - 0 1)

Belchikov, Nikolai Ivanovich

Volchek, Viktor Fedorovich

3rd Comm., Birnov MT, 2002

5n2/PnQp3B/1P2pp2/2PkN3/R1r1R3/2P5/2Kp1q1B/3N4

#2

12 + 9

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qe3
      • 2.Sxe3#
    • 1...Qh4
      • 2.Se3#
    • 1...Qf1
      • 2.Se3#
    • 1...Qg2
      • 2.Se3#
    • 1...Qxh2
      • 2.Se3#
    • 1...Rxc3+
      • 2.Sxc3#
    • 1...Rxe4
      • 2.Bxe4#
    • 1...Sa5
      • 2.Qd6#
    • 1...Sd6
      • 2.Qxd6#
    • 1...Sd8
      • 2.Qd6#
    • 1...fxe5
      • 2.Rxe5#
    • 1...d6
      • 2.Qc6#
  • Tries
    • 1.Sd3?
      • threat
        • 2.Qxb7#
      • 1...Rxc3+
        • 2.Sxc3#
      • 1...Qxc5
        • 2.Sf4#
      • 1...Rxc5
        • 2.Sb4#
      • 1...Sxc5
        • 2.Qd6#
      • 1...Sa5
        • 2.Qd6#
      • 1...Sd6
        • 2.Qxd6#
      • 1...Sd8
        • 2.Qd6#
      • 1...e5!
    • 1.Qxd7+?
      • 1...Kxc5
        • 2.Qc6#
      • 1...Sd6
        • 2.Qc6#
        • 2.Qxd6#
      • 1...Sxd7!
  • Keys
    • 1.Ra5!
      • threat
        • 2.Qxb7#
      • 1...Rxc3+
        • 2.Sxc3#
      • 1...Qxc5
        • 2.Se3#
      • 1...Rxc5
        • 2.c4#
      • 1...Sxa5
        • 2.Qd6#
      • 1...Sxc5
        • 2.a8Q#
        • 2.a8B#
      • 1...Sd6
        • 2.Qxd6#
      • 1...Sd8
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 8
  • Sets
    • Q(b);N_GUARD::S(A),XQ(b)
    • Q(b);N_GUARD::S(A)
    • Q(b);N_GUARD,XB(C)::S(A)
    • R(c);CHECK,XP(D)::S(A),XR(c)
    • R(c);N_PINP(D),OGATE,XR(F)::B(L),XR(c)
    • S(g);N_GUARD::QAR1(K)
    • S(g);N_GUARD::QAR1(K),XS(g)
    • P(f);OGATE,XS(H)::R1(F),XP(f)
    • P(h);N_GUARD::QAB1(K)
  • Tries
    • Try
      • S(H);
      • Threat
        • QAB(K),XS(g)
      • Vars
        • R(c);CHECK,XP(D)::S(A),XR(c)
        • Q(b);N_GUARD,XP(G)::S(H)
        • R(c);N_GUARD,XP(G)::S(H)
        • S(g);N_GUARD,XP(G)::QAR1(K)
        • S(g);N_GUARD::QAR1(K)
        • S(g);N_GUARD::QAR1(K),XS(g)
      • Refutation
        • P(e);
    • Try
      • Q(K);CHECK,XP(h)
      • Vars
        • K(d);P-FLIGHT,XP(G)::QAR1(K)
      • Refutation
        • S(i);XQ(K)
  • Actual
    • R(E);
    • Threat
      • QAB(K),XS(g)
    • Vars
      • R(c);CHECK,XP(D)::S(A),XR(c)
      • Q(b);N_GUARD,P_SPINQ(b),XP(G)::S(A)
      • R(c);P_SPINR(c),XP(G)::P(D)
      • S(g);N_GUARD,XR(E)::QAR1(K)
      • S(g);P_SPINS(g),XP(G)::P=Q
      • S(g);N_GUARD::QAR1(K),XS(g)
      • S(g);N_GUARD::QAR1(K)
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