MESON Chess Problem Database

Problem Display
PID: 138068 (2B5/1P1Q4/K2nN2r/P2k1P1p/R1n4R/8/1bq1N2B/5b2 w - - 0 1)

Umnov, Evgeny Ivanovich

3rd Prize, Sverdlovsk Sports Committee, 1946

2B5/1P1Q4/K2nN2r/P2k1P1p/R1n4R/8/1bq1N2B/5b2

#2

11 + 8

14752 Soviet Chess Compositions (1945-1947) 1949
133 The Problemist Supplement 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Bc1
      • 2.Rd4#
    • 1...Ba3
      • 2.Rd4#
    • 1...Bd4
      • 2.Rxd4#
    • 1...Sd2
      • 2.Qxd6#
    • 1...Sa3
      • 2.Qxd6#
    • 1...Se3
      • 2.Qxd6#
    • 1...Sxa5
      • 2.Qxd6#
    • 1...Sb6
      • 2.Qxd6#
  • Tries
    • 1.Raxc4?
      • threat
        • 2.Sc7#
        • 2.Qc6#
        • 2.Qxd6#
      • 1...Rxe6
        • 2.Qc6#
        • 2.Qxe6#
      • 1...Qe4
        • 2.Rc5#
        • 2.Qc6#
      • 1...Bd4
        • 2.Rcxd4#
        • 2.Rhxd4#
        • 2.Qc6#
      • 1...Qa4
        • 2.Sc7#
        • 2.Rc5#
        • 2.Qxd6#
      • 1...Ba3
        • 2.Sc7#
        • 2.Rcd4#
        • 2.Rhd4#
        • 2.Qc6#
      • 1...Be5
        • 2.Sc7#
        • 2.Qc6#
      • 1...Qxc4+!
  • Keys
    • 1.Qc7!
      • threat
        • 2.Qc5#
      • 1...Rxe6
        • 2.Bxe6#
      • 1...Sxa5
        • 2.Qxd6#
      • 1...Sxb7
        • 2.Bxb7#
        • 2.Qxb7#
      • 1...Ba3
        • 2.Rd4#
      • 1...Bd4
        • 2.Rxd4#
      • 1...Sd2
        • 2.Qxd6#
      • 1...Sa3
        • 2.Qxd6#
      • 1...Se3
        • 2.Qxd6#
      • 1...Se5
        • 2.Sf4#
      • 1...Sb6
        • 2.Qxd6#
      • 1...Se4
        • 2.Sf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • B(b);N_GUARD::R1(D)
    • B(b);N_GUARD::R1(D),XB(b)
    • S(d);N_GUARD,P_PINS(A)::QAR1(J),XS(g)
    • S(d);N_GUARD,P_PINS(A),XP(E)::QAR1(J),XS(g)
  • Tries
    • Try
      • R(C);XS(d)
      • Threat
        • DUALS(3)
      • Refutation
        • Q(c);CHECK,XR(C)
  • Actual
    • Q(J);N_PINS(g)
    • Threat
      • QAR1(J)
    • Vars
      • R(h);OGATE,XS(H)::B(K),XR(h)
      • S(d);N_GUARD,P_PINS(A),XP(E)::QAR1(J),XS(g)
      • B(b);N_GUARD::R1(D)
      • B(b);N_GUARD::R1(D),XB(b)
      • S(d);N_GUARD,P_PINS(A)::QAR1(J),XS(g)
      • S(d);P_PINS(A),SBLOCK::S(H)
      • S(g);P_PINS(H),SBLOCK::S(A)
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