MESON Chess Problem Database

Problem Display
PID: 138121 (4n2K/b2qnpN1/Rr3kpN/8/4p2P/2Rb2B1/8/3Q4 w - - 0 1)

Yaroslavtsev, Arkady Ivanovich

2nd Prize, Uzbekistan Sports Committee, 1947

4n2K/b2qnpN1/Rr3kpN/8/4p2P/2Rb2B1/8/3Q4

#2

8 + 10

14752 Soviet Chess Compositions (1945-1947) 1949

SOLUTION

  • SOUND
  • Sets
    • 1...Qa4
      • 2.Sg4#
    • 1...Qg4
      • 2.Sxg4#
    • 1...Qb5
      • 2.Sg4#
    • 1...Qc6
      • 2.Sg4#
    • 1...Qe6
      • 2.Sxe8#
    • 1...Qd4
      • 2.Sg4#
    • 1...Qd5
      • 2.Sg4#
    • 1...Qd6
      • 2.Sg4#
    • 1...Qb7
      • 2.Sg4#
    • 1...Qc7
      • 2.Sg4#
    • 1...Qd8
      • 2.Sg4#
    • 1...Re6
      • 2.Sg4#
    • 1...Sd5
      • 2.Sg8#
    • 1...Sf5
      • 2.Sg8#
    • 1...Sc6
      • 2.Sg8#
    • 1...Sc8
      • 2.Sg8#
    • 1...Sg8
      • 2.Sxg8#
  • Tries
    • 1.Qf3+?
      • 1...Qf5
        • 2.Sg4#
      • 1...Sf5
        • 2.Sg8#
      • 1...exf3!
    • 1.Qf1+?
      • 1...Qf5
        • 2.Sg4#
      • 1...Sf5
        • 2.Sg8#
      • 1...Bxf1!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Rc6#
      • 1...Sd5
        • 2.Sg8#
      • 1...Sf5
        • 2.Sg8#
      • 1...Sc6
        • 2.Sg8#
      • 1...Sc8
        • 2.Sg8#
      • 1...Sg8
        • 2.Sxg8#
      • 1...Sd6
        • 2.Rb3#
      • 1...Qc6
        • 2.Sg4#
        • 2.Rxc6#
      • 1...Qe6
        • 2.Sxe8#
      • 1...Qd4
        • 2.Sg4#
      • 1...Qd6
        • 2.Sg4#
      • 1...Rc6
        • 2.Rcxc6#
      • 1...Rd6
        • 2.Rc5#
      • 1...Re6
        • 2.Sg4#
      • 1...Bc4
        • 2.Rf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 8
  • Sets
    • Q(g);N_GUARD::S(F)
    • Q(g);N_GUARD::S(F),XQ(g)
    • Q(g);N_GUARD,N_SPINR(c)::S(F)
    • Q(g);N_GUARD,N_SPINR(c),SBLOCK::S(G),XS(j)
    • R(c);S_CUTQ(g)::S(F)
    • S(h);N_GUARD::S(F)
    • S(h);N_GUARD,N_SPINR(c)::S(F)
    • S(h);N_GUARD::S(F),XS(h)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • Q(g);P_SPINQ(g)::S(F)
        • S(h);P_SPINS(h)::S(F)
      • Refutation
        • P(b);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • Q(g);P_SPINQ(g)::S(F)
        • S(h);P_SPINS(h)::S(F)
      • Refutation
        • B(a);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAB(A)+R(B),DCHECK
    • Vars
      • S(h);N_GUARD::S(F)
      • S(h);N_GUARD,N_SPINR(c)::S(F)
      • S(h);N_GUARD::S(F),XS(h)
      • S(j);N_SPINR(c),S_CUTQ(g)::QAB(A)+R(B)
      • Q(g);N_GUARD,N_SPINR(c),SBLOCK::S(G),XS(j)
      • Q(g);N_GUARD::S(F)
      • Q(g);N_GUARD,N_SPINR(c)::S(F)
      • R(c);::QAB(A)+R(B),DCHECK,XR(c)
      • R(c);S_CUTQ(g)::QAB(A)+R(B)
      • R(c);S_CUTQ(g)::S(F)
      • B(a);OGATE::QAB(A)+R(B),DCHECK
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