MESON Chess Problem Database

Problem Display
PID: 43370 (6K1/8/3pR3/4bN2/3BNk2/3r1b1Q/8/7B w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

6K1/8/3pR3/4bN2/3BNk2/3r1b1Q/8/7B

#2

7 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Rd1
      • 2.Qxf3#
    • 1...Rd2
      • 2.Qxf3#
    • 1...Rxd4
      • 2.Qxf3#
  • Tries
    • 1.Se3?
      • threat
        • 2.Qf5#
        • 2.Qxf3#
      • 1...Kxe4
        • 2.Qg4#
        • 2.Qh4#
      • 1...Rxd4
        • 2.Qxf3#
      • 1...Bxh1
        • 2.Qg4#
        • 2.Qf5#
      • 1...Bxe4
        • 2.Qg4#
        • 2.Qh4#
      • 1...Bxd4
        • 2.Sd5#
        • 2.Qxf3#
        • 2.Qh6#
      • 1...Bd1
        • 2.Sd5#
        • 2.Qf5#
        • 2.Qh2#
        • 2.Qg3#
        • 2.Qh6#
      • 1...Be2
        • 2.Sd5#
        • 2.Qf5#
        • 2.Qh2#
        • 2.Qg3#
        • 2.Qh6#
      • 1...Bg2
        • 2.Qg4#
        • 2.Qf5#
      • 1...Bg4
        • 2.Qxg4#
        • 2.Qh2#
        • 2.Qg3#
        • 2.Qh6#
      • 1...Bh5
        • 2.Sd5#
        • 2.Qf5#
        • 2.Qh2#
        • 2.Qg3#
      • 1...Rxe3!
    • 1.Be3+?
      • 1...Kxe4
        • 2.Bxf3#
        • 2.Qxf3#
      • 1...Rxe3!
    • 1.Qh4+?
      • 1...Bg4
        • 2.Qg5#
      • 1...Kxf5!
  • Keys
    • 1.Se7!
      • threat
        • 2.Qf5#
      • 1...Kxe4
        • 2.Qg4#
        • 2.Qh4#
      • 1...Rxd4
        • 2.Qxf3#
      • 1...Bxe4
        • 2.Qh4#
      • 1...Bxd4
        • 2.Sd5#
      • 1...Bg4
        • 2.Qh6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • R(a);N_GUARD::QAR1(B),XB(b)
    • R(a);N_GUARD,XB(C)::QAR1(B),XB(b)
  • Tries
    • Try
      • S(E);
      • Threat
        • DUALS(2)
      • Vars
        • R(a);XB(C)::QAR1(B),XB(b)
      • Refutation
        • R(a);XS(E)
    • Try
      • B(C);CHECK
      • Refutation
        • R(a);XB(C)
    • Try
      • Q(B);CHECK
      • Vars
        • B(b);P_SPINB(b)::QAB1(B)
      • Refutation
        • K(c);P-FLIGHT,XS(E)
  • Actual
    • S(E);
    • Threat
      • QAR1(B)
    • Vars
      • R(a);N_GUARD,XB(C)::QAR1(B),XB(b)
      • B(b);N_GUARD,XS(D)::QAR2(B)
      • B(d);XB(C)::S(E)
      • B(b);SBLOCK::QAB(B)
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Developed and maintained by Brian Stephenson.
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