MESON Chess Problem Database

Problem Display
PID: 57384 (7R/8/8/3N4/5Bkn/3Q2b1/8/3K4 w - - 0 1)

Shifrin, Semion

The Problemist, 2005

7R/8/8/3N4/5Bkn/3Q2b1/8/3K4

#2

5 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Kh3
      • 2.Qxg3#
    • 1...Sf5
      • 2.Qe2#
  • Tries
    • 1.Sf6+?
      • 1...Kh3
        • 2.Qxg3#
      • 1...Kxf4!
    • 1.Rg8+?
      • 1...Kh3
        • 2.Qxg3#
      • 1...Kh5
        • 2.Sf6#
        • 2.Qh7#
      • 1...Sg6!
  • Keys
    • 1.Rh5!
      • 1...Kh3
        • 2.Qxg3#
      • 1...Kxh5
        • 2.Sf6#
      • 1...Bxf4
        • 2.Sf6#
      • 1...Be1
        • 2.Rg5#
      • 1...Bf2
        • 2.Rg5#
      • 1...Bh2
        • 2.Rg5#
      • 1...Sg2
        • 2.Qe2#
      • 1...Sf3
        • 2.Qf5#
      • 1...Sf5
        • 2.Qe2#
      • 1...Sg6
        • 2.Qe2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • K(b);P_SPINB(a),P_SPINS(c),S_FLIGHT::QAR1(B),XB(a)
    • S(c);N_GUARD,SBLOCK::QAB(B)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • K(b);P_SPINB(a),P_SPINS(c),S_FLIGHT::QAR1(B),XB(a)
      • Refutation
        • K(b);P-FLIGHT,XB(C)
    • Try
      • R(E);CHECK
      • Vars
        • K(b);P_SPINB(a),S_FLIGHT::QAR1(B),XB(a)
      • Refutation
        • S(c);P_SPINS(c)
  • Actual
    • R(E);
    • Vars
      • K(b);P_SPINB(a),P_SPINS(c),S_FLIGHT::QAR1(B),XB(a)
      • K(b);S_FLIGHT,XR(E)::S(D)
      • B(a);SBLOCK,XB(C)::S(D)
      • B(a);::R1(E)
      • S(c);N_GUARD::QAB(B)
      • S(c);N_GUARD,SBLOCK::QAB1(B)
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