MESON Chess Problem Database

Problem Display
PID: 52913 (8/4K3/4p3/2Rbkp2/4q3/8/3R3P/4Q1N1 w - - 0 1)

von Essen, G

2nd Prize, Source?, 0000

8/4K3/4p3/2Rbkp2/4q3/8/3R3P/4Q1N1

#2

6 + 5

117 Suomen Shakki 1926

SOLUTION

  • SOUND
  • Sets
    • 1...Kf4
      • 2.Qg3#
    • 1...Qe3
      • 2.Qxe3#
  • Tries
    • 1.Rdxd5+?
      • 1...Kf4
        • 2.Qg3#
      • 1...exd5!
    • 1.Rcxd5+?
      • 1...Kf4
        • 2.Qg3#
      • 1...exd5!
    • 1.Qa1+?
      • 1...Qd4
        • 2.Qxd4#
      • 1...Kf4!
  • Keys
    • 1.Rd4!
      • 1...Kxd4
        • 2.Qc3#
      • 1...Kf4
        • 2.Qg3#
      • 1...Qxe1
        • 2.Sf3#
      • 1...Qe2
        • 2.Sf3#
      • 1...Qe3
        • 2.Sf3#
        • 2.Qxe3#
      • 1...f4
        • 2.Qxe4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • K(c);N_SPINB(b),N_SPINQ(a),S_FLIGHT::QAB1(A)
    • Q(a);OGATEB::QAR2(A),XQ(a)
  • Tries
    • Try
      • R(C);CHECK,XB(b)
      • Vars
        • K(c);N_SPINQ(a),S_FLIGHT::QAB1(A)
      • Refutation
        • P(e);P_SPINP(e),XR(C)
    • Try
      • R(E);CHECK,XB(b)
      • Vars
        • K(c);N_SPINQ(a),S_FLIGHT::QAB1(A)
      • Refutation
        • P(e);XR(E)
    • Try
      • Q(A);CHECK,N_PINQ(a)
      • Vars
        • Q(a);N_GUARD,P_SPINQ(a)::QAB1(A),XQ(a)
      • Refutation
        • K(c);N_SPINB(b),S_FLIGHT
  • Actual
    • R(C);
    • Vars
      • K(c);N_SPINB(b),N_SPINQ(a),OGATEB,S_FLIGHT,XR(C)::QAB1(A)
      • K(c);N_SPINB(b),S_FLIGHT::QAB1(A)
      • Q(a);N_SPINQ(a),XQ(A)::S(B)
      • Q(a);::S(B)
      • P(d);N_GUARD::QAR1(A),XQ(a)
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