MESON Chess Problem Database

Problem Display
PID: 7904 (4B3/8/Np2p3/pPn1P3/k3p3/4P3/pPPK4/3Q3b w - - 0 1)

Balashov, Evgeny Fedorovich

The Problemist, 1994

4B3/8/Np2p3/pPn1P3/k3p3/4P3/pPPK4/3Q3b

#2

9 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sb3+
      • 2.cxb3#
    • 1...Sd3
      • 2.cxd3#
      • 2.c3#
      • 2.c4#
    • 1...Sxa6
      • 2.c3#
    • 1...Sb7
      • 2.c3#
      • 2.c4#
    • 1...Sd7
      • 2.c4#
    • 1...a1Q
      • 2.Qxa1#
    • 1...a1S
      • 2.Qxa1#
    • 1...a1B
      • 2.Qxa1#
    • 1...a1R
      • 2.Qxa1#
  • Tries
    • 1.Ke2?
      • threat
        • 2.Qd4#
      • 1...Sxa6
        • 2.c3#
      • 1...Sd7
        • 2.c4#
      • 1...Sb3
        • 2.cxb3#
      • 1...Sd3
        • 2.cxd3#
        • 2.c3#
        • 2.c4#
      • 1...Bf3+!
    • 1.Sxc5+?
      • 1...bxc5
        • 2.c3#
      • 1...Kb4!
    • 1.b3+?
      • 1...Ka3
        • 2.Qc1#
      • 1...Sxb3+!
  • Keys
    • 1.Ke1!
      • threat
        • 2.Qd4#
      • 1...Sd3+
        • 2.cxd3#
      • 1...Sxa6
        • 2.c3#
      • 1...Sd7
        • 2.c4#
      • 1...a1Q
        • 2.Qxa1#
      • 1...a1R
        • 2.Qxa1#
      • 1...Sb3
        • 2.cxb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • S(f);CHECK,OGATE::P(C),XS(f)
    • S(f);N_GUARD,XS(H)::QAB(A)+P(C)
    • S(f);N_GUARD::QAB(A)+P(C)
    • P(b);OGATEB::QAR(A),XQ(b)
    • P(b);OGATEB::QAR(A),XS(b)
    • P(b);OGATEB::QAR(A),XB(b)
    • P(b);OGATEB::QAR(A),XR(b)
  • Tries
    • Try
      • K(D);P-FLIGHT
      • Threat
        • QAR(A)
      • Vars
        • S(f);N_GUARD,XS(H)::QAB(A)+P(C)
        • S(f);N_GUARD::QAB(A)+P(C)
        • S(f);OGATE::P(C),XS(f)
      • Refutation
        • B(a);CHECK
    • Try
      • S(H);CHECK,XS(f)
      • Vars
        • P(g);XS(H)::QAB(A)+P(C)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • P(B);CHECK
      • Vars
        • K(c);P-FLIGHT::QAB(A)
      • Refutation
        • S(f);CHECK,XP(B)
  • Actual
    • K(D);S_FLIGHT
    • Threat
      • QAR(A)
    • Vars
      • S(f);CHECK,OGATE::QAB(A)+P(C),XS(f)
      • S(f);N_GUARD,XS(H)::QAB(A)+P(C)
      • S(f);N_GUARD::QAB(A)+P(C)
      • P(b);OGATEB,P_PINQ(A)::QAR(A),XQ(b)
      • P(b);OGATEB,P_PINQ(A)::QAR(A),XR(b)
      • S(f);OGATE::P(C),XS(f)
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