MESON Chess Problem Database

Problem Display
PID: 93379 (k4r2/1p3b2/1K6/8/8/3Q4/8/8 w - - 0 1)

Fabel, Karl

Shakhmaty v SSSR, 1936

k4r2/1p3b2/1K6/8/8/3Q4/8/8

#2

2 + 4

6490 yacpdb 2009
145 StrateGems 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Rb8
      • 2.Qa3#
    • 1...Rd8
      • 2.Qxd8#
    • 1...Be8
      • 2.Qd8#
  • Tries
    • 1.Qe4?
      • threat
        • 2.Qxb7#
      • 1...Kb8
        • 2.Qxb7#
      • 1...Rb8
        • 2.Qa4#
      • 1...Bd5!
    • 1.Qa6+?
      • 1...Kb8
        • 2.Qxb7#
      • 1...bxa6!
    • 1.Qd5?
      • threat
        • 2.Qxb7#
      • 1...Kb8
        • 2.Qxb7#
      • 1...Rb8
        • 2.Qa5#
      • 1...Bxd5!
    • 1.Qd7?
      • threat
        • 2.Qxb7#
      • 1...Kb8
        • 2.Qxb7#
      • 1...Rb8
        • 2.Qa4#
      • 1...Bd5!
  • Keys
    • 1.Qf3!
      • threat
        • 2.Qxb7#
      • 1...Kb8
        • 2.Qxb7#
      • 1...Rb8
        • 2.Qa3#
      • 1...Bd5
        • 2.Qxf8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • R(d);SBLOCK::QAR(A)
    • R(d);N_GUARD::QAR(A),XR(d)
    • B(b);S_CUTR(d)::QAR(A)
  • Tries
    • Try
      • Q(A);P_PINP(a)
      • Threat
        • QAB1(A),XP(a)
      • Vars
        • K(c);N_SPINP(a),P-FLIGHT::QAR1(A),XP(a)
        • R(d);SBLOCK::QAR(A)
      • Refutation
        • B(b);N_SPINP(a)
    • Try
      • Q(A);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR1(A),XP(a)
      • Refutation
        • P(a);XQ(A)
    • Try
      • Q(A);P_PINP(a)
      • Threat
        • QAB1(A),XP(a)
      • Vars
        • K(c);N_SPINP(a),P-FLIGHT::QAR1(A),XP(a)
        • R(d);SBLOCK::QAR(A)
      • Refutation
        • B(b);N_SPINP(a),XQ(A)
    • Try
      • Q(A);
      • Threat
        • QAB1(A),XP(a)
      • Vars
        • K(c);P-FLIGHT::QAR1(A),XP(a)
        • R(d);SBLOCK::QAR(A)
      • Refutation
        • B(b);
  • Actual
    • Q(A);P_PINP(a)
    • Threat
      • QAB1(A),XP(a)
    • Vars
      • K(c);N_SPINP(a),P-FLIGHT::QAR1(A),XP(a)
      • R(d);SBLOCK::QAR(A)
      • B(b);N_SPINP(a),OGATE::QAR(A),XR(d)
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