MESON Chess Problem Database

Problem Display
PID: 27439 (4Rn2/r3N2b/pR2P2K/1n2k1P1/1N1p2P1/BrP2P2/B7/2Q5 w - - 0 1)

Barulin, Mikhail Mikhailovich

3rd HM., Il Problema, 1932

4Rn2/r3N2b/pR2P2K/1n2k1P1/1N1p2P1/BrP2P2/B7/2Q5

#2

13 + 8

3979 Systematic Terminology 1984
4640 Chess Wizardry: The New ABC of Chess Problems 1996

SOLUTION

  • SOUND
  • Sets
    • 1...Rb1
      • 2.Sbc6#
    • 1...Rb2
      • 2.Sbc6#
    • 1...Bd3
      • 2.Sxd3#
    • 1...Be4
      • 2.f4#
    • 1...Bg8
      • 2.Sd3#
    • 1...Sd6
      • 2.Sec6#
    • 1...Sxe6
      • 2.Sbc6#
    • 1...Sg6
      • 2.Sd3#
  • Tries
    • 1.Sed5?
      • threat
        • 2.Qf4#
      • 1...Sg6
        • 2.Qe1#
      • 1...Rf7!
    • 1.Rxf8?
      • threat
        • 2.Qf4#
      • 1...Bf5
        • 2.Rxf5#
      • 1...Sd6!
    • 1.Qe3+?
      • 1...Be4
        • 2.Sd3#
        • 2.Qxe4#
        • 2.f4#
      • 1...dxe3!
    • 1.Qe1+?
      • 1...Be4
        • 2.Sd3#
        • 2.Qg3#
        • 2.Qxe4#
      • 1...Kf4!
    • 1.cxd4+?
      • 1...Kxd4
        • 2.Sec6#
      • 1...Sxd4!
  • Keys
    • 1.Qd2!
      • threat
        • 2.Qh2#
      • 1...Sxe6
        • 2.Sbc6#
      • 1...dxc3
        • 2.Sec6#
      • 1...Sd6
        • 2.Sec6#
      • 1...Rb2
        • 2.Sbc6#
      • 1...Sg6
        • 2.Sd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • R(a);::S(F)
    • B(g);N_GUARD::S(F),XB(g)
    • B(g);SBLOCK::P(E)
    • B(g);N_GUARD::S(F)
    • S(c);SBLOCK::S(L)
    • S(h);SBLOCK,XP(J)::S(F)
    • S(h);S_CUTB(g)::S(F)
  • Tries
    • Try
      • S(L);
      • Threat
        • QAB1(A)
      • Vars
        • S(h);S_CUTB(g)::QAR(A)
      • Refutation
        • R(f);
    • Try
      • R(M);XS(h)
      • Threat
        • QAB1(A)
      • Vars
        • B(g);N_GUARD::R1(M),XB(g)
      • Refutation
        • S(c);
    • Try
      • Q(A);CHECK
      • Refutation
        • P(b);XQ(A)
    • Try
      • Q(A);CHECK
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • P(D);CHECK,XP(b)
      • Vars
        • K(d);S_FLIGHT,XP(D)::S(L)
      • Refutation
        • S(c);XP(D)
  • Actual
    • Q(A);
    • Threat
      • QAB(A)
    • Vars
      • S(h);SBLOCK,XP(J)::S(F)
      • P(b);XP(D)::S(L)
      • S(c);SBLOCK::S(L)
      • R(a);::S(F)
      • S(h);S_CUTB(g)::S(F)
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