MESON Chess Problem Database

Problem Display
PID: 21964 (8/1N6/8/4k3/2R1b1QK/8/8/8 w - - 0 1)

Justnaes, Olav

Morgenbladet, 1922

8/1N6/8/4k3/2R1b1QK/8/8/8

#2

4 + 2

4884 154 norske miniatyrproblemer 1974
2838 Fun with Chess Miniatures 1996
3310 2345 Chess Problems 1997
5454 Near Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Kd5
      • 2.Qxe4#
  • Tries
    • 1.Kg5?
      • threat
        • 2.Qxe4#
      • 1...Kd5
        • 2.Qxe4#
      • 1...Bf5
        • 2.Qxf5#
      • 1...Bb1
        • 2.Rc5#
      • 1...Bh1
        • 2.Qf5#
      • 1...Bc2
        • 2.Rc5#
      • 1...Bg2
        • 2.Qf5#
      • 1...Bd3
        • 2.Rc5#
      • 1...Bf3
        • 2.Qf5#
      • 1...Bd5
        • 2.Qf5#
      • 1...Bc6
        • 2.Qf5#
      • 1...Bg6
        • 2.Rc5#
      • 1...Bh7
        • 2.Rc5#
      • 1...Bxb7!
    • 1.Rxe4+?
      • 1...Kd5
        • 2.Qe6#
      • 1...Kf6!
    • 1.Qe6+?
      • 1...Kf4
        • 2.Qxe4#
      • 1...Kxe6!
  • Keys
    • 1.Sd8!
      • 1...Kd5
        • 2.Qe6#
      • 1...Kd6
        • 2.Qe6#
      • 1...Kf6
        • 2.Qg5#
      • 1...Bb1
        • 2.Qe6#
      • 1...Bh1
        • 2.Qe6#
      • 1...Bc2
        • 2.Qe6#
      • 1...Bg2
        • 2.Qe6#
      • 1...Bd3
        • 2.Qe6#
      • 1...Bf3
        • 2.Qe6#
      • 1...Bd5
        • 2.Qf4#
      • 1...Bf5
        • 2.Qd4#
      • 1...Bc6
        • 2.Qe6#
      • 1...Bg6
        • 2.Qe6#
      • 1...Bb7
        • 2.Qe6#
      • 1...Bh7
        • 2.Qe6#
      • 1...Ba8
        • 2.Qe6#

This anticipates 110500(1943), 176189(1968), 34901(1998)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 15
    • REMOVED MATES = 0
  • Sets
    • K(b);P-FLIGHT::QAB1(B),XB(a)
  • Tries
    • Try
      • K(C);S_FLIGHT
      • Threat
        • QAR1(B),XB(a)
      • Vars
        • K(b);P-FLIGHT::QAB1(B),XB(a)
        • B(a);N_GUARD::QAR1(B),XB(a)
        • B(a);N_GUARD::R(A)
        • B(a);N_GUARD::QAR1(B)
        • B(a);N_GUARD,SBLOCK::QAR1(B)
      • Refutation
        • B(a);XS(D)
    • Try
      • R(A);CHECK,XB(a)
      • Vars
        • K(b);P-FLIGHT::QAB1(B)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);OGATE,P_SPINB(a),S_FLIGHT::QAR1(B),XB(a)
      • Refutation
        • K(b);P-FLIGHT,XQ(B)
  • Actual
    • S(D);
    • Vars
      • K(b);P-FLIGHT::QAB1(B)
      • K(b);S_FLIGHT::QAR1(B)
      • K(b);S_FLIGHT::QAB1(B)
      • B(a);::QAR1(B)
      • B(a);SBLOCK::QAB1(B)
      • B(a);OGATE,SBLOCK::QAB1(B)
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