MESON Chess Problem Database

Problem Display
PID: 234463 (8/6p1/7n/8/4Q3/7k/6Rb/5K2 w - - 0 1)

Lincoln, Robert A

ChessStar, 2013

8/6p1/7n/8/4Q3/7k/6Rb/5K2

#2

3 + 4

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sg4
      • 2.Qxg4#
    • 1...Sf5
      • 2.Qg4#
    • 1...Sf7
      • 2.Qg4#
    • 1...Sg8
      • 2.Qg4#
  • Tries
    • 1.Rxh2+?
      • 1...Kxh2
        • 2.Qg2#
        • 2.Qh4#
      • 1...Kg3!
    • 1.Qd3+?
      • 1...Bg3
        • 2.Qxg3#
      • 1...Kh4!
    • 1.Qf3+?
      • 1...Bg3
        • 2.Qxg3#
      • 1...Kh4!
    • 1.Qe3+?
      • 1...Bg3
        • 2.Qxg3#
      • 1...Kh4!
    • 1.Qf4?
      • threat
        • 2.Rxh2#
        • 2.Qxh2#
      • 1...Sg4
        • 2.Qxg4#
      • 1...Bg1
        • 2.Qg3#
      • 1...Bg3
        • 2.Qxg3#
      • 1...Bxf4!
    • 1.Qe5?
      • threat
        • 2.Qxh2#
        • 2.Qh5#
      • 1...Kh4
        • 2.Qxh2#
      • 1...Bg3
        • 2.Qxg3#
      • 1...Bg1
        • 2.Qg3#
        • 2.Qh5#
      • 1...Bf4
        • 2.Qh5#
      • 1...Sg4
        • 2.Qh5#
      • 1...Sf5
        • 2.Qxh2#
      • 1...g5
        • 2.Qxh2#
      • 1...g6
        • 2.Qxh2#
      • 1...Bxe5!
  • Keys
    • 1.Qg6!
      • threat
        • 2.Qh5#
      • 1...Kh4
        • 2.Rxh2#
      • 1...Bg3
        • 2.Qxg3#
      • 1...Sf5
        • 2.Qg4#

FEATURES

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