MESON Chess Problem Database

Problem Display
PID: 146387 (r3B3/b2R4/1p6/1kNP2nb/1p4r1/1P1Np1p1/1KP1Q2q/R7 w - - 0 1)

Vorobiev, Nikolai

1st Prize, Shakhmatny Listok, 1930

r3B3/b2R4/1p6/1kNP2nb/1p4r1/1P1Np1p1/1KP1Q2q/R7

#2

10 + 11

56 The Problemist 2012

SOLUTION

  • SOUND
  • Sets
    • 1...Bb8
      • 2.Rf7#
    • 1...Sf7
      • 2.Rd8#
    • 1...bxc5
      • 2.Rb7#
  • Tries
    • 1.Sf2+?
      • 1...Rc4
        • 2.Qxc4#
      • 1...Kxc5!
    • 1.Sf4+?
      • 1...Kxc5
        • 2.Qc4#
      • 1...Qxe2!
    • 1.Ra5+?
      • 1...bxa5
        • 2.Rb7#
      • 1...Kxa5!
  • Keys
    • 1.Sb7!
      • threat
        • 2.Sd6#
      • 1...Bb8
        • 2.Rf7#
      • 1...Se4
        • 2.Sf2#
      • 1...Sf7
        • 2.Rd8#
      • 1...g2
        • 2.Sf4#

There are these versions: 146388

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • B(j);S_CUTR(k)::B(J)+R(I)
    • S(g);S_CUTB(h)::B(J)+R(I)
    • P(i);XS(G)::B(J)+R(I),DCHECK
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • R(e);N_GUARD,P_SPINR(e)::QAB1(D),XR(e)
      • Refutation
        • K(f);P-FLIGHT,XS(G)
    • Try
      • S(F);CHECK
      • Vars
        • K(f);P-FLIGHT,XS(G)::QAR1(D)
      • Refutation
        • Q(a);P_PINP(C),XQ(D)
    • Try
      • R(A);CHECK
      • Vars
        • P(i);SBLOCK,XR(A)::B(J)+R(I),DCHECK
      • Refutation
        • K(f);P-FLIGHT,XR(A)
  • Actual
    • S(G);
    • Threat
      • S(G)
    • Vars
      • B(j);S_CUTR(k)::B(J)+R(I)
      • S(g);S_CUTR(e)::QAB(D)+S(F)
      • S(g);S_CUTB(h)::B(J)+R(I)
      • P(c);S_CUTQ(a)::QAB(D)+S(F)
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