MESON Chess Problem Database

Problem Display
PID: 16303 (KBR2bB1/8/p1r1N1R1/3krP2/2pp2Q1/8/1N2p1p1/6q1 w - - 0 1)

Levman, Semyon Semyonovich

1/2 Prize, 64 Shakhmatnoe obozrenie, 1940

KBR2bB1/8/p1r1N1R1/3krP2/2pp2Q1/8/1N2p1p1/6q1

#2

9 + 10

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

SOLUTION

  • SOUND
  • Sets
    • 1...Qh2
      • 2.Qxd4#
    • 1...Qa1
      • 2.Qxd4#
    • 1...Qb1
      • 2.Qxd4#
    • 1...Qc1
      • 2.Qxd4#
    • 1...Qe1
      • 2.Qxd4#
    • 1...Qf1
      • 2.Qxd4#
    • 1...Qh1
      • 2.Qxd4#
    • 1...Re3
      • 2.Qxd4#
    • 1...Rxf5
      • 2.Qxf5#
    • 1...Rc5
      • 2.Sc7#
    • 1...Rd6
      • 2.Rc5#
    • 1...Bc5
      • 2.Sc7#
  • Tries
    • 1.Sf4+?
      • 1...Ke4
        • 2.Sxg2#
        • 2.Sd5#
      • 1...Kc5!
  • Keys
    • 1.Sa4!
      • threat
        • 2.Sc7#
      • 1...Rxf5
        • 2.Qxf5#
      • 1...Rexe6
        • 2.Qf3#
      • 1...Rcxe6
        • 2.Sb6#
      • 1...Rc7
        • 2.Sxc7#
      • 1...Re3
        • 2.Qxd4#
      • 1...Re4
        • 2.Sf4#
      • 1...Rd6
        • 2.Rc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 9
  • Sets
    • Q(a);N_GUARD::QAR1(B),XP(e)
    • R(g);S_CUTQ(a)::QAR1(B),XP(e)
    • R(g);OGATE,XP(C)::QAR2(B),XR(g)
    • R(i);SBLOCK::B(I)+S(D),DCHECK
    • R(i);OGATE::R1(H)
    • B(j);SBLOCK::B(I)+S(D),DCHECK
  • Tries
    • Try
      • S(D);CHECK
      • Refutation
        • K(f);P-FLIGHT,P_SPINR(i)
  • Actual
    • S(A);
    • Threat
      • B(I)+S(D),DCHECK
    • Vars
      • R(g);OGATE,XP(C)::QAR2(B),XR(g)
      • R(g);N_GUARD,P_SPINR(g),XS(D)::QAB(B)
      • R(i);N_GUARD,P_SPINR(i),XS(D)::S(A)
      • R(i);::B(I)+S(D),DCHECK,XR(i)
      • R(g);S_CUTQ(a)::QAR1(B),XP(e)
      • R(g);SBLOCK::B(I)+S(D),DCHECK
      • R(i);OGATE::R1(H)
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