MESON Chess Problem Database

Problem Display
PID: 11448 (R2R4/2Q1p3/2P1p3/2k2p2/2P2N1K/P3npp1/bB1n2p1/2rrq1b1 w - - 0 1)

Levman, Semyon Semyonovich

2/3 Prize, Chigorin MT, 1938-1939

R2R4/2Q1p3/2P1p3/2k2p2/2P2N1K/P3npp1/bB1n2p1/2rrq1b1

#2

9 + 14

3098 FIDE Album (1914-1944) (I) 1971

SOLUTION

  • SOUND
  • Sets
    • 1...Rxc4
      • 2.Ra5#
  • Tries
    • 1.Qa5+?
      • 1...Kxc4
        • 2.Qb4#
      • 1...Kxc6!
    • 1.Qb6+?
      • 1...Kxc4
        • 2.Ra4#
        • 2.Rd4#
        • 2.Qb4#
      • 1...Kxb6!
    • 1.Qd6+?
      • 1...Kxc4
        • 2.Qb4#
      • 1...Kb6
        • 2.Bd4#
        • 2.Rdb8#
      • 1...exd6!
    • 1.Qa7+?
      • 1...Kxc6
        • 2.Rac8#
      • 1...Kxc4!
    • 1.Qxe7+?
      • 1...Kxc4
        • 2.Qb4#
      • 1...Kxc6
        • 2.Ra6#
      • 1...Kb6!
  • Keys
    • 1.Qb7!
      • threat
        • 2.Qb5#
      • 1...Kxc4
        • 2.Qb4#
      • 1...Rxc4
        • 2.Ra5#
      • 1...Bxc4
        • 2.Bd4#
      • 1...Sdxc4
        • 2.Sxe6#
      • 1...Sexc4
        • 2.Sd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(a);P_PINS(D),SBLOCK,XP(C)::R(H)
  • Tries
    • Try
      • Q(G);CHECK
      • Vars
        • K(k);P-FLIGHT,XP(C)::QAR1(G)
      • Refutation
        • K(k);P-FLIGHT,XP(F)
    • Try
      • Q(G);CHECK
      • Refutation
        • K(k);S_FLIGHT,XQ(G)
    • Try
      • Q(G);CHECK
      • Vars
        • K(k);OGATE,P-FLIGHT,XP(C)::QAR1(G)
      • Refutation
        • P(n);XQ(G)
    • Try
      • Q(G);CHECK
      • Vars
        • K(k);P-FLIGHT,XP(F)::R(H)
      • Refutation
        • K(k);P-FLIGHT,XP(C)
    • Try
      • Q(G);CHECK,XP(n)
      • Vars
        • K(k);OGATE,P-FLIGHT,XP(C)::QAR1(G)
        • K(k);P-FLIGHT,XP(F)::R(H)
      • Refutation
        • K(k);S_FLIGHT
  • Actual
    • Q(G);
    • Threat
      • QAR1(G)
    • Vars
      • K(k);P-FLIGHT,XP(C)::QAR1(G)
      • R(a);P_PINS(D),SBLOCK,XP(C)::R(H)
      • B(e);SBLOCK,XP(C)::B(A)
      • S(f);SBLOCK,XP(C)::S(D),XP(m)
      • S(h);SBLOCK,XP(C)::S(D)
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