MESON Chess Problem Database

Problem Display
PID: 117350 (2b4b/r1P5/NQ2Np2/1p1kn2R/4RK2/5P2/3r4/nq3B2 w - - 0 1)

Levman, Semyon Semyonovich

Bristol Times and Mirror, 1928

2b4b/r1P5/NQ2Np2/1p1kn2R/4RK2/5P2/3r4/nq3B2

#2

9 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qa2
      • 2.Sb4#
    • 1...Qc2
      • 2.Sb4#
    • 1...Qd3
      • 2.Sb4#
    • 1...Qxe4+
      • 2.fxe4#
    • 1...Qc1
      • 2.Sb4#
    • 1...Qd1
      • 2.Sb4#
    • 1...Qe1
      • 2.Sb4#
    • 1...Qxf1
      • 2.Sb4#
    • 1...Qb4
      • 2.Sxb4#
    • 1...Ra2
      • 2.Rd4#
    • 1...Rb2
      • 2.Rd4#
    • 1...Rc2
      • 2.Rd4#
    • 1...Re2
      • 2.Rd4#
    • 1...Rf2
      • 2.Rd4#
    • 1...Rg2
      • 2.Rd4#
    • 1...Rh2
      • 2.Rd4#
    • 1...Rd4
      • 2.Rxd4#
    • 1...Rxc7
      • 2.Saxc7#
      • 2.Sexc7#
    • 1...Bxe6
      • 2.Qc5#
    • 1...Sb3
      • 2.Sb4#
    • 1...b4
      • 2.Bc4#
  • Tries
    • 1.Sd8?
      • threat
        • 2.Qc5#
        • 2.Qc6#
      • 1...Qxe4+
        • 2.fxe4#
      • 1...Rxc7
        • 2.Sxc7#
      • 1...Bxa6
        • 2.Qc6#
      • 1...Qc2
        • 2.Sb4#
      • 1...Qc1
        • 2.Sb4#
      • 1...Qb4
        • 2.Sxb4#
        • 2.Qc6#
      • 1...Rc2
        • 2.Rd4#
        • 2.Qd4#
      • 1...Bf5
        • 2.Qc5#
      • 1...Bb7
        • 2.Qc5#
        • 2.Qe6#
      • 1...Bd7
        • 2.Qc5#
      • 1...Sb3
        • 2.Sb4#
        • 2.Qc6#
      • 1...f5
        • 2.Qc5#
      • 1...Rxa6!
  • Keys
    • 1.Kf5!
      • threat
        • 2.Qc5#
      • 1...Qxe4+
        • 2.fxe4#
      • 1...Bxe6+
        • 2.Qxe6#
      • 1...Rxc7
        • 2.Sxc7#
      • 1...Qc2
        • 2.Sb4#
      • 1...Qc1
        • 2.Sb4#
      • 1...Qb4
        • 2.Sxb4#
      • 1...Rc2
        • 2.Rd4#
      • 1...Sb3
        • 2.Sb4#
      • 1...Sd3
        • 2.Rd4#
      • 1...Sd7
        • 2.Sf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 13
  • Sets
    • Q(b);N_GUARD::S(F)
    • Q(b);CHECK,OGATE,XR(C)::P(B),XQ(b)
    • Q(b);N_GUARD,P_PINP(B),XB(A)::S(F)
    • Q(b);N_GUARD,P_PINR(C)::S(F),XQ(b)
    • R(c);N_GUARD::R1(C)
    • R(c);N_GUARD,P_PINP(B)::R1(C)
    • R(c);N_GUARD,P_PINR(C)::R1(C),XR(c)
    • B(i);SBLOCK,XS(H)::QAR1(G)
    • S(a);S_CUTQ(b)::S(F)
    • P(d);N_GUARD::B(A)
  • Tries
    • Try
      • S(H);
      • Threat
        • DUALS(2)
      • Vars
        • Q(b);CHECK,OGATE,XR(C)::P(B),XQ(b)
        • R(h);XP(I)::S(F),XR(h)
        • B(i);XS(F)::QAB1(G)
        • Q(b);N_GUARD::S(F)
        • B(i);N_SPINS(f)::QAR1(G)
        • B(i);::QAR1(G)
        • P(g);N_SPINS(f)::QAR1(G)
      • Refutation
        • R(h);XS(F)
  • Actual
    • K(D);N_PINS(f),P-FLIGHT,P_SPINR(C),P_SPINS(H)
    • Threat
      • QAR1(G)
    • Vars
      • Q(b);CHECK,OGATE,XR(C)::P(B),XQ(b)
      • B(i);CHECK,OGATE,XS(H)::QAB1(G),XB(i)
      • R(h);XP(I)::S(F),XR(h)
      • Q(b);N_GUARD::S(F)
      • Q(b);N_GUARD,N_PINR(C)::S(F)
      • Q(b);N_GUARD,N_PINR(C)::S(F),XQ(b)
      • R(c);N_PINR(C)::R1(C)
      • S(a);S_CUTQ(b)::S(F)
      • S(f);N_PINR(C)::R1(C)
      • S(f);N_PINS(H)::S(H)
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