MESON Chess Problem Database

Problem Display
PID: 6599 (8/2K2Q2/3p2pN/1pp1k1r1/1PR1b2B/1nP1p3/BN2Pn1b/5R2 w - - 0 1)

Kofman, Rafael Moiseevich

1st Prize, Deutsche Arbeiter Schachbund, 1932

8/2K2Q2/3p2pN/1pp1k1r1/1PR1b2B/1nP1p3/BN2Pn1b/5R2

#2

11 + 11

5862 An ABC of Chess Problems 1970
3098 FIDE Album (1914-1944) (I) 1971
133 The Problemist Supplement 2013

SOLUTION

  • SOUND
  • Sets
    • 1...bxc4
      • 2.Sxc4#
  • Tries
    • 1.Rxe4+?
      • 1...Sxe4
        • 2.Sd3#
      • 1...Kxe4!
    • 1.Qe6+?
      • 1...Kf4
        • 2.Sd3#
        • 2.Rxe4#
        • 2.Qxe4#
      • 1...Kxe6!
    • 1.Qe7+?
      • 1...Kf4
        • 2.Sd3#
        • 2.Rxe4#
        • 2.Qxg5#
        • 2.Qxe4#
      • 1...Kd5!
  • Keys
    • 1.Qd7!
      • threat
        • 2.Qxd6#
      • 1...Kf4
        • 2.Sd3#
      • 1...Kd5
        • 2.Rxc5#
      • 1...Kf6
        • 2.Sg4#
      • 1...d5
        • 2.Qd6#

There are these versions: 60198

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • P(f);XR(G)::S(C),XP(f)
  • Tries
    • Try
      • R(G);CHECK,XB(e)
      • Vars
        • S(a);SBLOCK,XR(G)::S(C)
      • Refutation
        • K(h);P-FLIGHT,XR(G)
    • Try
      • Q(K);CHECK
      • Refutation
        • K(h);P-FLIGHT,XQ(K)
    • Try
      • Q(K);CHECK
      • Refutation
        • K(h);P-FLIGHT
  • Actual
    • Q(K);
    • Threat
      • QAB1(K),XP(j)
    • Vars
      • K(h);P_SPINB(e),P_SPINS(a),S_FLIGHT::S(C)
      • K(h);P-FLIGHT,P_SPINP(j)::R1(G),XP(g)
      • K(h);P_SPINR(i),P_SPINS(a),S_FLIGHT::S(I)
      • P(j);::QAB1(K)
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