MESON Chess Problem Database

Problem Display
PID: 162945 (R7/1k6/2n5/8/B2Q4/8/1K6/R7 w - - 0 1)

Bourd, Evgeny

StrateGems, 2012

R7/1k6/2n5/8/B2Q4/8/1K6/R7

#2

5 + 2

SOLUTION

  • SOUND
  • Sets
    • 1...Sb4
      • 2.Qa7#
    • 1...Sa5
      • 2.Qa7#
    • 1...Se5
      • 2.Qa7#
    • 1...Sa7
      • 2.Qxa7#
    • 1...Se7
      • 2.Qa7#
    • 1...Sd8
      • 2.Qa7#
  • Tries
    • 1.Qc5?
      • threat
        • 2.Qxc6#
      • 1...Kc7
        • 2.Qxc6#
      • 1...Sb4
        • 2.Qa7#
      • 1...Sd4
        • 2.Qa7#
      • 1...Sa5
        • 2.Qa7#
      • 1...Se5
        • 2.Qa7#
      • 1...Sa7
        • 2.Qxa7#
      • 1...Se7
        • 2.Qa7#
      • 1...Sb8
        • 2.Ra7#
      • 1...Sd8
        • 2.Qa7#
      • 1...Kxa8!
    • 1.Qb6+?
      • 1...Kxa8
        • 2.Bxc6#
      • 1...Kxb6!
    • 1.Qe4?
      • threat
        • 2.Qxc6#
      • 1...Kb6
        • 2.Qxc6#
      • 1...Kc7
        • 2.Qxc6#
      • 1...Kxa8!
    • 1.Qd5?
      • threat
        • 2.Qxc6#
      • 1...Kb6
        • 2.Qxc6#
      • 1...Kc7
        • 2.Qxc6#
      • 1...Kxa8!
    • 1.Qd7+?
      • 1...Kb6
        • 2.Qxc6#
      • 1...Kxa8!
  • Keys
    • 1.Qd6!
      • threat
        • 2.Qxc6#
      • 1...Kb6
        • 2.Qxc6#
      • 1...Kxa8
        • 2.Bxc6#
      • 1...Sb4
        • 2.Qb8#
      • 1...Sd4
        • 2.Qb8#
      • 1...Sa5
        • 2.Qb8#
      • 1...Se5
        • 2.Qb8#
      • 1...Sa7
        • 2.Rb8#
      • 1...Se7
        • 2.Qb8#
      • 1...Sb8
        • 2.Qxb8#
      • 1...Sd8
        • 2.Qb8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 6
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::QAR1(D)
    • S(a);N_GUARD::QAR1(D),XS(a)
  • Tries
    • Try
      • Q(D);
      • Threat
        • QAB1(D),XS(a)
      • Vars
        • K(b);P-FLIGHT,P_SPINS(a)::QAR1(D),XS(a)
        • S(a);N_GUARD::QAR1(D)
        • S(a);N_GUARD::QAR1(D),XS(a)
        • S(a);N_GUARD,SBLOCK::R1(E)
      • Refutation
        • K(b);S_FLIGHT,XR(E)
    • Try
      • Q(D);CHECK
      • Vars
        • K(b);S_FLIGHT,XR(E)::R(A)+B(C),DCHECK,XS(a)
      • Refutation
        • K(b);P-FLIGHT,XQ(D)
    • Try
      • Q(D);P_PINS(a)
      • Threat
        • QAB1(D),XS(a)
      • Vars
        • K(b);N_SPINS(a),P-FLIGHT::QAR1(D),XS(a)
      • Refutation
        • K(b);S_FLIGHT,XR(E)
    • Try
      • Q(D);P_PINS(a)
      • Threat
        • QAB1(D),XS(a)
      • Vars
        • K(b);N_SPINS(a),P-FLIGHT::QAR1(D),XS(a)
      • Refutation
        • K(b);S_FLIGHT,XR(E)
    • Try
      • Q(D);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(D),XS(a)
      • Refutation
        • K(b);S_FLIGHT,XR(E)
  • Actual
    • Q(D);
    • Threat
      • QAB1(D),XS(a)
    • Vars
      • K(b);P-FLIGHT,P_SPINS(a)::QAR1(D),XS(a)
      • K(b);S_FLIGHT,XR(E)::R(A)+B(C),DCHECK,XS(a)
      • S(a);N_GUARD::QAR1(D)
      • S(a);N_GUARD,SBLOCK::R1(E)
      • S(a);N_GUARD::QAR1(D),XS(a)
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