MESON Chess Problem Database

Problem Display
PID: 226420 (7b/8/R3N1nB/1R2Pk1B/K2QN2p/2pp1p1r/2pqr3/8 w - - 0 1)

Levman, Semyon Semyonovich

British Chess Magazine, 1931

7b/8/R3N1nB/1R2Pk1B/K2QN2p/2pp1p1r/2pqr3/8

#2

9 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Bxe5
      • 2.Sg7#
    • 1...Bg7
      • 2.Sxg7#
  • Tries
    • 1.Sg3+?
      • 1...hxg3
        • 2.Bg4#
        • 2.Qg4#
      • 1...Rxg3!
    • 1.Qxd3?
      • threat
        • 2.Sg3#
        • 2.Sd4#
      • 1...Rxe4+
        • 2.Sd4#
      • 1...Qxh6
        • 2.Sg3#
      • 1...Bxe5
        • 2.Sd4#
        • 2.Sg7#
      • 1...Sxe5
        • 2.Sd4#
      • 1...Qe3
        • 2.Sg3#
      • 1...Qf4
        • 2.Sd4#
      • 1...Qg5
        • 2.Sg3#
      • 1...Rg3
        • 2.Sxg3#
        • 2.Sd4#
      • 1...Qxd3!
    • 1.Qd5?
      • threat
        • 2.Sd6#
        • 2.Sd4#
      • 1...Qxh6
        • 2.Sd6#
      • 1...Bxe5
        • 2.Sd4#
        • 2.Sg7#
      • 1...Sxe5
        • 2.Sd4#
      • 1...Qe3
        • 2.Sd6#
      • 1...Qf4
        • 2.Sd4#
      • 1...Qg5
        • 2.Sd6#
      • 1...Rxe4+!
  • Keys
    • 1.Qd7!
      • threat
        • 2.Sd6#
      • 1...Rxe4+
        • 2.Sd4#
      • 1...Kxe4
        • 2.Bxg6#
      • 1...Bxe5
        • 2.S6c5#
      • 1...Sxe5
        • 2.Qh7#
      • 1...Qf4
        • 2.Sg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • B(k);N_GUARD,P_SPINB(k),XP(E)::S(H)
    • B(k);N_GUARD::S(H),XB(k)
  • Tries
    • Try
      • S(C);CHECK
      • Refutation
        • R(g);XS(C)
    • Try
      • Q(B);XP(e)
      • Threat
        • DUALS(2)
      • Vars
        • R(c);CHECK,P_SPINR(c),XS(C)::S(H)
        • Q(b);XB(I)::QAB(B)+S(C),DCHECK
        • S(j);P_SPINS(j),XP(E)::S(H)
        • Q(b);::QAB(B)+S(C),DCHECK
        • Q(b);P_PINS(C)::S(H)
      • Refutation
        • Q(b);XQ(B)
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • Q(b);XB(I)::S(C)
        • S(j);P_SPINS(j),XP(E)::S(H)
        • Q(b);::S(C)
        • Q(b);P_PINS(C)::S(H)
      • Refutation
        • R(c);CHECK,XS(C)
  • Actual
    • Q(B);
    • Threat
      • S(C)
    • Vars
      • R(c);CHECK,SBLOCK,XS(C)::QAB(B)+S(H),DCHECK
      • K(i);S_FLIGHT,XS(C)::B(F),XS(j)
      • B(k);P_SPINB(k),SBLOCK,XP(E)::QAB(B)+S(H)
      • S(j);OGATEB,P_SPINS(j),XP(E)::QAB(B)
      • Q(b);P_PINS(C),SBLOCK::QAB(B)+S(H)
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