MESON Chess Problem Database

Problem Display
PID: 263933 (2r5/3R1r2/2B2P2/b2p2Q1/K1p1kN2/2R1n3/1P2p3/5nB1 w - - 0 1)

Gerasimenko, Nikolai Mikhailovich

Melnichenko, Viktor Oleksandrovich

1st HM., British Chess Magazine, 1968

2r5/3R1r2/2B2P2/b2p2Q1/K1p1kN2/2R1n3/1P2p3/5nB1

#2

9 + 9

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kf3
      • 2.Bxd5#
    • 1...Kd4
      • 2.Qxd5#
    • 1...Sd1
      • 2.Bxd5#
    • 1...Sc2
      • 2.Bxd5#
    • 1...Sg2
      • 2.Bxd5#
    • 1...Sg4
      • 2.Bxd5#
  • Tries
    • 1.Bxd5+?
      • 1...Kd4
        • 2.Se6#
      • 1...Sxd5!
    • 1.Rxe3+?
      • 1...Kd4
        • 2.Se6#
        • 2.Rxd5#
        • 2.Qxd5#
      • 1...Sxe3!
    • 1.Rxc4+?
      • 1...Sxc4
        • 2.Bxd5#
      • 1...Kf3!
    • 1.Re7+?
      • 1...Kf3
        • 2.Bxd5#
      • 1...Kd4
        • 2.Qxd5#
      • 1...Rxe7!
  • Keys
    • 1.Sxd5!
      • threat
        • 2.Qf4#
      • 1...Kf3
        • 2.Sc7#
      • 1...Kd4
        • 2.Se7#
      • 1...Rxf6
        • 2.Sxf6#
      • 1...Bxc3
        • 2.Sxc3#
      • 1...Sxd5
        • 2.Bxd5#
      • 1...Bc7
        • 2.Sxe3#
      • 1...Sg2
        • 2.Sc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • K(e);N_GUARD,P_SPINS(c),S_FLIGHT::B(G),XP(g)
    • K(e);N_GUARD,P-FLIGHT,P_SPINS(c)::QAR1(F),XP(g)
    • S(c);N_GUARD::B(G),XP(g)
  • Tries
    • Try
      • B(G);CHECK,XP(g)
      • Vars
        • K(e);P-FLIGHT,P_SPINS(c)::S(E)
      • Refutation
        • S(c);XB(G)
    • Try
      • R(C);CHECK,XS(c)
      • Refutation
        • S(a);XR(C)
    • Try
      • R(C);CHECK,XP(d)
      • Vars
        • S(c);XR(C)::B(G),XP(g)
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • R(I);CHECK
      • Vars
        • K(e);N_GUARD,P_SPINS(c),S_FLIGHT::B(G),XP(g)
        • K(e);N_GUARD,N_SPINP(g),P-FLIGHT,P_SPINS(c)::QAR1(F),XP(g)
      • Refutation
        • R(h);XR(I)
  • Actual
    • S(E);XP(g)
    • Threat
      • QAR1(F)
    • Vars
      • K(e);P_SPINS(c),S_FLIGHT::B(G)+S(E)
      • K(e);P-FLIGHT,P_SPINS(c),S_CUTR(i)::R(I)+S(E)
      • R(h);XP(H)::B(G)+S(E),DCHECK,XR(h)
      • B(f);XR(C)::B(G)+S(E),DCHECK,XB(f)
      • S(c);OGATE,P_SPINS(c),XS(E)::B(G),XS(c)
      • B(f);S_CUTR(i)::B(G)+S(E),XS(c)
      • S(c);N_GUARD::B(G)+S(E)
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