MESON Chess Problem Database

Problem Display
PID: 7452 (1KN4n/p3R3/5k1B/8/6pN/p5p1/B4q2/5Q1R w - - 0 1)

Hoffmann, Fritz

Die Welt, 1990

1KN4n/p3R3/5k1B/8/6pN/p5p1/B4q2/5Q1R

#2

8 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf1
      • 2.Rxf1#
    • 1...Qf4+
      • 2.Qxf4#
    • 1...Qf5
      • 2.Qxf5#
    • 1...Sf7
      • 2.Re6#
    • 1...g2
      • 2.Qxf2#
  • Tries
    • 1.Bg8?
      • threat
        • 2.Re6#
      • 1...Qf4+
        • 2.Qxf4#
      • 1...Sf7!
    • 1.Be3?
      • threat
        • 2.Qa6#
      • 1...Qf4+
        • 2.Qxf4#
      • 1...Qxf1
        • 2.Rxf1#
      • 1...Qf3
        • 2.Qa1#
      • 1...Qf5
        • 2.Qxf5#
      • 1...a6
        • 2.Qxa6#
      • 1...Sf7!
    • 1.Qa1+?
      • 1...Qd4
        • 2.Rf1#
        • 2.Qxd4#
      • 1...Qb2+!
  • Keys
    • 1.Re3!
      • threat
        • 2.Qa6#
      • 1...Qf4+
        • 2.Qxf4#
      • 1...Qxf1
        • 2.Rxf1#
      • 1...Qf3
        • 2.Qa1#
      • 1...Qf5
        • 2.Qxf5#
      • 1...Sf7
        • 2.Re6#
      • 1...a6
        • 2.Qxa6#

This is a version of 116406

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • Q(a);N_SPINQ(a),OGATE,XQ(A)::R(B),XQ(a)
    • Q(a);CHECK,OGATE::QAR2(A),XQ(a)
    • Q(a);OGATE::QAR1(A),XQ(a)
    • S(g);SBLOCK::R1(F)
    • P(c);N_GUARD::QAR(A),XQ(a)
  • Tries
    • Try
      • B(C);
      • Threat
        • R1(F)
      • Vars
        • Q(a);CHECK,OGATE::QAR2(A),XQ(a)
      • Refutation
        • S(g);
    • Try
      • B(E);
      • Threat
        • QAR(A)
      • Vars
        • Q(a);CHECK,OGATE::QAR2(A),XQ(a)
        • Q(a);N_SPINQ(a),OGATE,XQ(A)::R(B),XQ(a)
        • Q(a);N_GUARD::QAB(A)
        • Q(a);OGATE::QAR1(A),XQ(a)
        • P(f);::QAR(A),XP(f)
      • Refutation
        • S(g);
    • Try
      • Q(A);CHECK,N_PINQ(a)
      • Refutation
        • Q(a);CHECK,P_SPINQ(a)
  • Actual
    • R(F);
    • Threat
      • QAR(A)
    • Vars
      • Q(a);CHECK,OGATE::QAR2(A),XQ(a)
      • Q(a);N_SPINQ(a),OGATE,XQ(A)::R(B),XQ(a)
      • Q(a);N_GUARD::QAB(A)
      • Q(a);OGATE::QAR1(A),XQ(a)
      • S(g);SBLOCK::R1(F)
      • P(f);::QAR(A),XP(f)
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