MESON Chess Problem Database

Problem Display
PID: 34901 (8/N7/8/3k4/1R1b1QK1/8/8/8 w - - 0 1)

Leschemelle, Matthieu

Phenix, 1998

8/N7/8/3k4/1R1b1QK1/8/8/8

#2

4 + 2

3666 Problem Paradise 1999
5454 Near Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Kc5
      • 2.Qxd4#
  • Tries
    • 1.Kf5?
      • threat
        • 2.Qxd4#
      • 1...Kc5
        • 2.Qxd4#
      • 1...Be5
        • 2.Qxe5#
      • 1...Ba1
        • 2.Rb5#
      • 1...Bg1
        • 2.Qe5#
      • 1...Bb2
        • 2.Rb5#
      • 1...Bf2
        • 2.Qe5#
      • 1...Bc3
        • 2.Rb5#
      • 1...Be3
        • 2.Qe5#
      • 1...Bc5
        • 2.Qe5#
      • 1...Bb6
        • 2.Qe5#
      • 1...Bf6
        • 2.Rb5#
      • 1...Bg7
        • 2.Rb5#
      • 1...Bh8
        • 2.Rb5#
      • 1...Bxa7!
    • 1.Rxd4+?
      • 1...Kc5
        • 2.Qd6#
      • 1...Ke6!
    • 1.Qd6+?
      • 1...Ke4
        • 2.Qxd4#
      • 1...Kxd6!
  • Keys
    • 1.Sc8!
      • 1...Kc5
        • 2.Qd6#
      • 1...Kc6
        • 2.Qd6#
      • 1...Ke6
        • 2.Qf5#
      • 1...Ba1
        • 2.Qd6#
      • 1...Bg1
        • 2.Qd6#
      • 1...Bb2
        • 2.Qd6#
      • 1...Bf2
        • 2.Qd6#
      • 1...Bc3
        • 2.Qd6#
      • 1...Be3
        • 2.Qd6#
      • 1...Bc5
        • 2.Qe4#
      • 1...Be5
        • 2.Qc4#
      • 1...Bb6
        • 2.Qd6#
      • 1...Bf6
        • 2.Qd6#
      • 1...Ba7
        • 2.Qd6#
      • 1...Bg7
        • 2.Qd6#
      • 1...Bh8
        • 2.Qd6#

Anticipated by 21964(1922), 110500(1943), 176189(1968)

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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