MESON Chess Problem Database

Problem Display
PID: 22202 (8/3Q4/1p2p3/3qP3/1p2R3/RN1k4/1B1N4/1K6 w - - 0 1)

Knuppert, Hugo

1st Prize, Europe Echecs, 1973

8/3Q4/1p2p3/3qP3/1p2R3/RN1k4/1B1N4/1K6

#2

8 + 5

259 Thema Danicum 1976
3753 FIDE Album (1971-1973) 1978
3364 Solving in Style 1985
133 The Problemist Supplement 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Qd4
      • 2.Qxd4#
    • 1...Qd6
      • 2.Qb5#
      • 2.Qxd6#
  • Tries
    • 1.Ra7?
      • 1...Qxd7
        • 2.Rxd7#
      • 1...Qd4
        • 2.Qxd4#
      • 1...Qd6
        • 2.Qb5#
        • 2.Qxd6#
      • 1...b5!
    • 1.Qb5+?
      • 1...Qc4
        • 2.Qxc4#
      • 1...Qxb5!
    • 1.Qf7?
      • threat
        • 2.Qf1#
        • 2.Qf3#
      • 1...Qxb3
        • 2.Qd7#
      • 1...Qd4
        • 2.Qf1#
      • 1...Qc5
        • 2.Qf1#
      • 1...Qxe4!
    • 1.Qh7?
      • threat
        • 2.Qh3#
      • 1...Qxb3
        • 2.Qd7#
      • 1...Qxe4
        • 2.Qxe4#
      • 1...Qxe5
        • 2.Rxe5#
      • 1...Qc5
        • 2.Re1#
      • 1...Qd4!
  • Keys
    • 1.Bd4!
      • threat
        • 2.Re3#
      • 1...Qxb3+
        • 2.Bb2#
      • 1...Qxe4
        • 2.Qb5#
      • 1...Qxd4
        • 2.Qxd4#
      • 1...Qxe5
        • 2.Bxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • Q(c);OGATE::QAR1(H),XQ(c)
  • Tries
    • Try
      • R(D);
      • Vars
        • Q(c);N_SPINQ(c),OGATE,XQ(H)::R(D),XQ(c)
        • Q(c);OGATE::QAR1(H),XQ(c)
      • Refutation
        • P(d);
    • Try
      • Q(H);CHECK,N_PINQ(c)
      • Vars
        • Q(c);N_GUARD,P_SPINQ(c)::QAB1(H),XQ(c)
      • Refutation
        • Q(c);XQ(H)
    • Try
      • Q(H);N_PINQ(c)
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);OGATEB,P_PINB(B),P_SPINQ(c),XS(E)::QAR(H)
        • Q(c);::QAB(H)
      • Refutation
        • Q(c);XR(F)
    • Try
      • Q(H);N_PINQ(c)
      • Threat
        • QAR(H)
      • Vars
        • Q(c);OGATEB,P_PINB(B),P_SPINQ(c),XS(E)::QAR(H)
        • Q(c);OGATE,P_SPINQ(c),XR(F)::QAB1(H),XQ(c)
        • Q(c);OGATE,XP(G)::QAB(H)+R(F),XQ(c)
        • Q(c);N_GUARD::QAB(H)+R(F)
      • Refutation
        • Q(c);
  • Actual
    • B(B);N_PINQ(c)
    • Threat
      • R1(F)
    • Vars
      • Q(c);CHECK,OGATEB,P_SPINQ(c),XS(E)::QAR(H)+B(B)
      • Q(c);N_GUARD,XR(F)::QAB(H)
      • Q(c);OGATE,P_SPINQ(c),XB(B)::QAR1(H),XQ(c)
      • Q(c);OGATE,XP(G)::QAR(H)+B(B),XQ(c)
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