MESON Chess Problem Database

Problem Display
PID: 6458 (4Q1b1/q1Np4/p2Bn3/4Np2/2RPkp2/R3PpP1/K1P5/1B6 w - - 0 1)

Hannemann, Knud Harald

1st Prize, Skakbladet, 1929

4Q1b1/q1Np4/p2Bn3/4Np2/2RPkp2/R3PpP1/K1P5/1B6

#2

12 + 9

35 L'Italia Scacchistica 1930
4035 Aarsskrift for DSK 1933
3098 FIDE Album (1914-1944) (I) 1971
23 Die Schwalbe 2003

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd4
      • 2.Qa8#
    • 1...Qa8
      • 2.Qxa8#
    • 1...Sxd4
      • 2.Sf7#
    • 1...Sc5
      • 2.d5#
    • 1...fxe3
      • 2.c3#
  • Tries
    • 1.Sg4?
      • threat
        • 2.Sf2#
        • 2.Sf6#
        • 2.c3#
      • 1...Qxc7
        • 2.Sf6#
      • 1...fxe3
        • 2.Sf6#
        • 2.Rxe3#
        • 2.c3#
      • 1...fxg3
        • 2.Sf6#
        • 2.c3#
      • 1...fxg4
        • 2.Qg6#
      • 1...Qb6
        • 2.Sf2#
        • 2.Sf6#
      • 1...Qb8
        • 2.Sf2#
        • 2.Sf6#
        • 2.d5#
      • 1...Qb7
        • 2.Sf2#
        • 2.Sf6#
        • 2.d5#
      • 1...f2!
    • 1.Qh5?
      • threat
        • 2.Qxf3#
      • 1...f2
        • 2.Qf3#
      • 1...Sg5!
    • 1.Qa8+?
      • 1...Qb7
        • 2.Qxb7#
      • 1...Qxa8!
    • 1.d5+?
      • 1...Sd4
        • 2.Sf7#
      • 1...Qd4!
  • Keys
    • 1.Rb4!
      • threat
        • 2.c4#
      • 1...Sxd4+
        • 2.Sf7#
      • 1...Sc5+
        • 2.d5#
      • 1...Qxd4
        • 2.Qa8#
      • 1...fxe3
        • 2.c3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • Q(g);N_GUARD,P_SPINQ(g),XP(H)::QAB(L)
    • Q(g);N_GUARD::QAB(L),XQ(g)
    • S(f);P_PINR(G),P_SPINS(f),XP(H)::QAR(L)+S(I)
    • S(f);N_GUARD,P_PINR(G),S_CUTQ(g)::R(G)+P(H)
    • P(c);SBLOCK,XP(E)::B(A)+P(C)
  • Tries
    • Try
      • S(I);P_PINS(f)
      • Threat
        • DUALS(3)
      • Vars
        • Q(g);XS(K)::S(I)
        • P(d);OGATEB,XS(I)::QAB(L)
      • Refutation
        • P(a);
    • Try
      • Q(L);
      • Threat
        • QAB1(L),XP(a)
      • Vars
        • P(a);::QAB1(L)
      • Refutation
        • S(f);P_PINR(G)
    • Try
      • Q(L);CHECK
      • Vars
        • Q(g);N_GUARD,P_SPINQ(g)::QAB(L),XQ(g)
      • Refutation
        • Q(g);XQ(L)
    • Try
      • P(H);CHECK
      • Vars
        • S(f);P_SPINS(f),S_CUTQ(g)::QAR(L)+S(I)
      • Refutation
        • Q(g);P_SPINQ(g)
  • Actual
    • R(G);
    • Threat
      • B(A)+P(C)
    • Vars
      • S(f);CHECK,P_SPINS(f),XP(H)::QAR(L)+S(I)
      • S(f);CHECK,N_GUARD,S_CUTQ(g)::R(G)+P(H)
      • Q(g);N_GUARD,P_SPINQ(g),XP(H)::QAB(L)
      • P(c);SBLOCK,XP(E)::B(A)+P(C)
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