MESON Chess Problem Database

Problem Display
PID: 29663 (8/5p2/1P2p1r1/Bpk1Nn2/PpP2pR1/8/R2Qb3/K6B w - - 0 1)

Neptaev, Nikolai I

Die Schwalbe, 1992

8/5p2/1P2p1r1/Bpk1Nn2/PpP2pR1/8/R2Qb3/K6B

#2

10 + 9

5454 Near Snap 2013

SOLUTION

  • SOUND
  • Sets
    • 1...Bxc4
      • 2.Sd7#
    • 1...Sd4
      • 2.Qxb4#
    • 1...f3
      • 2.Qxb4#
    • 1...bxc4
      • 2.Sd7#
  • Tries
    • 1.Rc2?
      • threat
        • 2.Sd7#
      • 1...Sd4
        • 2.Qxb4#
      • 1...Bf3
        • 2.cxb5#
      • 1...f3
        • 2.Qxb4#
      • 1...Bd3!
    • 1.Rxf4?
      • threat
        • 2.Sd7#
        • 2.Qxb4#
      • 1...Bd3
        • 2.Qxb4#
      • 1...Sd4
        • 2.Qxb4#
        • 2.Qxd4#
      • 1...Rg2
        • 2.Qxb4#
      • 1...Bf3
        • 2.Qxb4#
      • 1...b3
        • 2.Sd7#
        • 2.Qb4#
      • 1...Rg1+!
    • 1.Qxf4?
      • threat
        • 2.Sd7#
      • 1...Kd6
        • 2.Bxb4#
      • 1...Sd4
        • 2.Qxd4#
      • 1...Bf3!
  • Keys
    • 1.cxb5!
      • threat
        • 2.Qxb4#
      • 1...Bf3
        • 2.Rc2#
      • 1...Bc4
        • 2.Sd7#
      • 1...b3
        • 2.Qb4#
      • 1...f3
        • 2.Sd7#

Anticipated by 7550(1991)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • B(a);SBLOCK,XP(F)::S(I)
    • S(f);SBLOCK::QAB1(D),XP(b)
    • P(c);::QAB1(D),XP(b)
    • P(d);SBLOCK,XP(F)::S(I)
  • Tries
    • Try
      • R(C);
      • Threat
        • S(I)
      • Vars
        • S(f);SBLOCK::QAB1(D),XP(b)
        • B(a);N_GUARD::R(C)+P(F),XP(d)
        • P(c);::QAB1(D),XP(b)
      • Refutation
        • B(a);
    • Try
      • R(G);XP(c)
      • Threat
        • DUALS(2)
      • Vars
        • B(a);::QAB1(D),XP(b)
        • R(h);::QAB1(D),XP(b)
      • Refutation
        • R(h);CHECK
    • Try
      • Q(D);XP(c)
      • Threat
        • S(I)
      • Vars
        • K(e);S_FLIGHT::B(H),XP(b)
        • S(f);N_GUARD::QAB1(D),XS(f)
      • Refutation
        • B(a);
  • Actual
    • P(F);XP(d)
    • Threat
      • QAB1(D),XP(b)
    • Vars
      • B(a);N_GUARD::R(C)
      • B(a);SBLOCK::S(I)
      • P(b);::QAB1(D)
      • P(c);::S(I)
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