MESON Chess Problem Database

Problem Display
PID: 138123 (2qn4/3NB3/8/bb1R4/k7/1N1p4/PP6/r1nB3K w - - 0 1)

Umnov, Evgeny Ivanovich

5th Prize, Uzbekistan Sports Committee, 1947

2qn4/3NB3/8/bb1R4/k7/1N1p4/PP6/r1nB3K

#2

8 + 8

14752 Soviet Chess Compositions (1945-1947) 1949

SOLUTION

  • SOUND
  • Sets
    • 1...Qa6
      • 2.Sxc1#
    • 1...Qb7
      • 2.Sxc1#
    • 1...Qxd7
      • 2.Sxc1#
    • 1...Qa8
      • 2.Sxc1#
    • 1...Qb8
      • 2.Sxc1#
    • 1...Be1
      • 2.Sb6#
    • 1...Bd2
      • 2.Sb6#
    • 1...Bc3
      • 2.Sb6#
    • 1...Bb4
      • 2.Sb6#
    • 1...Bb6
      • 2.Sxb6#
    • 1...Bc4
      • 2.Rxa5#
    • 1...Ba6
      • 2.Rxa5#
    • 1...Bc6
      • 2.Sxc1#
    • 1...Bxd7
      • 2.Rxa5#
    • 1...Sxb3
      • 2.axb3#
    • 1...Sc6
      • 2.Sxc1#
  • Tries
    • 1.Sxa1+?
      • 1...Sb3
        • 2.Bxb3#
        • 2.axb3#
      • 1...Qc2!
    • 1.Sd2+?
      • 1...Sb3
        • 2.axb3#
      • 1...Qc2!
    • 1.Sd4+?
      • 1...Sb3
        • 2.axb3#
      • 1...Qc2!
    • 1.Rd4+?
      • 1...Qc4
        • 2.Sxc1#
      • 1...Bb4
        • 2.Sb6#
        • 2.Rxb4#
      • 1...Bc4!
  • Keys
    • 1.Ba3!
      • threat
        • 2.Sbc5#
      • 1...Bxd7
        • 2.Rxa5#
      • 1...Sxb3
        • 2.axb3#
      • 1...Qc5
        • 2.Sbxc5#
        • 2.Sdxc5#
      • 1...Be1
        • 2.Sb6#
      • 1...Bd2
        • 2.Sb6#
      • 1...Bc3
        • 2.Sb6#
      • 1...Bb4
        • 2.Sb6#
      • 1...Bb6
        • 2.Sxb6#
      • 1...Bc7
        • 2.Sdc5#
      • 1...Bc4
        • 2.Rxa5#
      • 1...Ba6
        • 2.Rxa5#
      • 1...Bc6
        • 2.Sxc1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 6
  • Sets
    • Q(g);N_GUARD::B(A)+S(E),XS(b)
    • Q(g);N_GUARD,P_PINR(F)::B(A)+S(E),XS(b)
    • Q(g);N_GUARD,XS(G)::B(A)+S(E),XS(b)
    • B(e);N_GUARD::S(G)
    • B(e);N_GUARD::S(G),XB(e)
    • B(f);OGATE::R1(F),XB(e)
    • B(f);P_PINR(F),S_CUTQ(g)::B(A)+S(E),XS(b)
    • B(f);OGATE,XS(G)::R1(F),XB(e)
    • S(b);OGATE,P_PINB(A),P_SPINS(b),XS(E)::P(C),XS(b)
    • S(h);S_CUTQ(g)::B(A)+S(E),XS(b)
  • Tries
    • Try
      • S(E);CHECK,XR(a)
      • Refutation
        • Q(g);P_SPINQ(g)
    • Try
      • S(E);CHECK
      • Vars
        • S(b);OGATE,P_PINB(A),P_SPINS(b)::P(C),XS(b)
      • Refutation
        • Q(g);P_SPINQ(g)
    • Try
      • S(E);CHECK
      • Vars
        • S(b);OGATE,P_PINB(A),P_SPINS(b)::P(C),XS(b)
      • Refutation
        • Q(g);P_SPINQ(g)
    • Try
      • R(F);CHECK
      • Vars
        • Q(g);P_SPINQ(g)::B(A)+S(E),XS(b)
      • Refutation
        • B(f);P_SPINB(f)
  • Actual
    • B(H);
    • Threat
      • B(A)+S(E),DCHECK
    • Vars
      • B(f);OGATE,XS(G)::R1(F),XB(e)
      • S(b);OGATE,P_PINB(A),P_SPINS(b),XS(E)::P(C),XS(b)
      • B(e);N_GUARD::S(G)
      • B(e);N_GUARD::S(G),XB(e)
      • B(e);S_CUTQ(g)::S(G)
      • B(f);OGATE::R1(F),XB(e)
      • B(f);P_PINR(F),S_CUTQ(g)::B(A)+S(E),XS(b)
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