MESON Chess Problem Database

Problem Display
PID: 6531 (5B2/6Q1/2P1p3/1Bn1pq2/1N1kP2R/K1pp1P2/b1P2n2/3R1N2 w - - 0 1)

Restad, Birger

Il Problema, 1931

5B2/6Q1/2P1p3/1Bn1pq2/1N1kP2R/K1pp1P2/b1P2n2/3R1N2

#2

12 + 9

5862 An ABC of Chess Problems 1970
3098 FIDE Album (1914-1944) (I) 1971
5407 Selected Stocchi (II) 2003

SOLUTION

  • SOUND
  • Sets
    • 1...Sfxe4
      • 2.Qg1#
    • 1...Sb3
      • 2.Qd7#
    • 1...Scxe4
      • 2.Qa7#
  • Tries
    • 1.exf5+?
      • 1...Sfe4
        • 2.Qg1#
      • 1...Sce4
        • 2.Qa7#
      • 1...Sg4!
  • Keys
    • 1.Sxd3!
      • threat
        • 2.Bxc5#
      • 1...Qxe4
        • 2.Qxe5#
      • 1...Qxf8
        • 2.Qxe5#
      • 1...Sfxd3
        • 2.Qg1#
      • 1...Sfxe4
        • 2.Sxc5#
      • 1...Scxd3
        • 2.Qa7#
      • 1...Scxe4
        • 2.Sxf2#
      • 1...Sb3
        • 2.Qd7#
      • 1...Sa4
        • 2.Sxf2#
      • 1...Sa6
        • 2.Sxf2#
      • 1...Sb7
        • 2.Sxf2#
      • 1...Sd7
        • 2.Sxf2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • S(b);OGATEB,P_SPINS(b),XP(G)::QAB(K)
    • S(f);N_GUARD,S_CUTB(a)::QAR(K)
    • S(f);OGATEB,P_SPINS(f),XP(G)::QAB(K)
  • Tries
    • Try
      • P(G);CHECK,XQ(h)
      • Vars
        • S(b);P_SPINS(b),S_CUTP(g),S_CUTS(f)::QAB(K)
        • S(f);P_SPINS(f),S_CUTP(g),S_CUTS(b),S_CUTS(b)::QAB(K)
      • Refutation
        • S(b);P_SPINS(b)
  • Actual
    • S(F);P_PINP(g),XP(d)
    • Threat
      • B(L),XS(f)
    • Vars
      • Q(h);N_GUARD,P_SPINQ(h),XP(G)::QAB1(K),XP(g)
      • Q(h);N_GUARD,XB(L)::QAB1(K),XP(g)
      • S(b);OGATEB,P_SPINS(b),XS(F)::QAB(K)
      • S(b);N_GUARD,P_SPINS(b),XP(G)::R(A)+S(F),XS(f)
      • S(f);OGATEB,P_SPINS(f),XS(F)::QAB(K)
      • S(f);N_GUARD,P_SPINS(f),XP(G)::R(A)+S(F),XS(b)
      • S(f);N_GUARD,S_CUTB(a)::QAR(K)
      • S(f);N_GUARD::R(A)+S(F),XS(b)
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