MESON Chess Problem Database

Problem Display
PID: 43755 (Q3R3/2KbN2B/2P2p2/5Np1/R2Pk1P1/3p3r/3r2P1/2B5 w - - 0 1)

Levman, Semyon Semyonovich

HM., De Problemist, 1930

Q3R3/2KbN2B/2P2p2/5Np1/R2Pk1P1/3p3r/3r2P1/2B5

#2

12 + 7

20 De Problemist 1931

SOLUTION

  • SOUND
  • Sets
    • 1...Rd1
      • 2.Sg3#
      • 2.Sd6#
      • 2.cxd7#
    • 1...Ra2
      • 2.Sg3#
      • 2.Sd6#
      • 2.cxd7#
    • 1...Rb2
      • 2.Sg3#
      • 2.Sd6#
    • 1...Rc2
      • 2.Sg3#
      • 2.Sd6#
    • 1...Re2
      • 2.Sg3#
      • 2.Sd6#
      • 2.cxd7#
    • 1...Rf2
      • 2.Sg3#
      • 2.Sd6#
      • 2.cxd7#
    • 1...Rxg2
      • 2.cxd7#
  • Tries
    • 1.Bxd2?
      • threat
        • 2.Sg3#
        • 2.Sd6#
        • 2.cxd7#
      • 1...Bxf5
        • 2.Bxf5#
      • 1...Bxc6
        • 2.Sg3#
        • 2.Sd6#
        • 2.Qxc6#
      • 1...Bxe8
        • 2.Sg3#
        • 2.Sd6#
      • 1...Be6
        • 2.Sg3#
        • 2.Sd6#
      • 1...Rg3
        • 2.Sxg3#
        • 2.Sd6#
        • 2.cxd7#
      • 1...Bc8
        • 2.Sg3#
        • 2.Sd6#
      • 1...Re3!
  • Keys
    • 1.Kd6!
      • threat
        • 2.d5#
      • 1...Kf4
        • 2.d5#
      • 1...Rxg2
        • 2.cxd7#
      • 1...Bxf5
        • 2.Sd5#
      • 1...Bxc6
        • 2.Sg6#
      • 1...Ra2
        • 2.Sg3#
        • 2.cxd7#
      • 1...Rb2
        • 2.Sg3#
      • 1...Rc2
        • 2.Sg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • R(a);XP(B)::QAB(K)+P(G),XB(g)
  • Tries
    • Try
      • B(A);XR(a)
      • Threat
        • DUALS(3)
      • Vars
        • B(g);OGATE,P_SPINB(g),XS(F)::B(J),XB(g)
      • Refutation
        • R(c);
  • Actual
    • K(H);S_FLIGHT
    • Threat
      • R(C)+P(D)
    • Vars
      • K(d);P-FLIGHT,P_SPINR(a)::R(C)+P(D)
      • R(a);XP(B)::QAB(K)+P(G),XB(g)
      • B(g);N_GUARD,P_SPINB(g),XS(F)::R(L)+S(I)
      • B(g);N_GUARD,P_SPINB(g),XP(G)::R(L)+S(I)
      • R(a);::B(J)+S(F),DCHECK
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