MESON Chess Problem Database

Problem Display
PID: 240295 (kN1n4/3Q4/8/4b3/K7/1R6/8/8 w - - 0 1)

Lincoln, Robert A

Problem-Forum, 2010

kN1n4/3Q4/8/4b3/K7/1R6/8/8

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sc6
      • 2.Qb7#
    • 1...Se6
      • 2.Qb7#
    • 1...Sb7
      • 2.Qxb7#
    • 1...Sf7
      • 2.Qb7#
  • Tries
    • 1.Sc6?
      • threat
        • 2.Qa7#
      • 1...Sxc6
        • 2.Qb7#
      • 1...Bd4
        • 2.Rb8#
        • 2.Qc8#
        • 2.Qxd8#
      • 1...Bb8
        • 2.Rxb8#
      • 1...Sb7
        • 2.Qxb7#
      • 1...Bc7!
    • 1.Qb5?
      • threat
        • 2.Qa6#
        • 2.Qa5#
      • 1...Ka7
        • 2.Qa6#
        • 2.Qa5#
      • 1...Bxb8
        • 2.Qxb8#
      • 1...Sb7
        • 2.Qxb7#
      • 1...Bc3
        • 2.Qa6#
      • 1...Bc7
        • 2.Qa6#
      • 1...Sc6
        • 2.Qb7#
      • 1...Bd4!
    • 1.Qc6+?
      • 1...Ka7
        • 2.Qa6#
      • 1...Sb7
        • 2.Qxb7#
      • 1...Sxc6!
    • 1.Qd5+?
      • 1...Ka7
        • 2.Qa5#
      • 1...Sb7
        • 2.Qxb7#
      • 1...Sc6!
    • 1.Qxd8?
      • threat
        • 2.Qa5#
      • 1...Ka7
        • 2.Qa5#
      • 1...Bxb8
        • 2.Qxb8#
      • 1...Bd4
        • 2.Sc6#
      • 1...Bc3
        • 2.Sc6#
      • 1...Bc7!
  • Keys
    • 1.Qc8!
      • threat
        • 2.Qa6#
      • 1...Ka7
        • 2.Qa6#
      • 1...Bxb8
        • 2.Qxb8#
      • 1...Bd4
        • 2.Sc6#
      • 1...Sc6
        • 2.Qb7#
      • 1...Sb7
        • 2.Qxb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • S(c);N_GUARD::QAB1(C)
    • S(c);N_GUARD::QAB1(C),XS(c)
  • Tries
    • Try
      • S(D);
      • Threat
        • QAR1(C)
      • Vars
        • S(c);N_GUARD,XS(D)::QAB1(C)
        • B(a);N_GUARD::R1(A),XB(a)
        • S(c);N_GUARD::QAB1(C),XS(c)
      • Refutation
        • B(a);
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);OGATE,XS(D)::QAR1(C),XB(a)
        • S(c);N_GUARD::QAB1(C),XS(c)
        • B(a);::QAR2(C)
        • S(c);N_GUARD::QAB1(C)
      • Refutation
        • B(a);
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(C)
        • S(c);N_GUARD,P_SPINS(c)::QAB1(C),XS(c)
      • Refutation
        • S(c);XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR2(C)
        • S(c);N_GUARD,P_SPINS(c)::QAB1(C),XS(c)
      • Refutation
        • S(c);P_SPINS(c)
    • Try
      • Q(C);XS(c)
      • Threat
        • QAR(C)
      • Vars
        • K(b);P-FLIGHT::QAR2(C)
        • B(a);OGATE,P_SPINB(a),XS(D)::QAR1(C),XB(a)
        • B(a);N_GUARD::QAR(C)+S(D)
      • Refutation
        • B(a);
  • Actual
    • Q(C);
    • Threat
      • QAR2(C)
    • Vars
      • K(b);P-FLIGHT::QAR1(C)
      • B(a);OGATE,P_SPINB(a),XS(D)::QAR1(C),XB(a)
      • B(a);N_GUARD::QAR(C)+S(D)
      • S(c);N_GUARD::QAB1(C)
      • S(c);N_GUARD::QAB1(C),XS(c)
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