MESON Chess Problem Database

Problem Display
PID: 183515 (8/5K2/6p1/7k/4NR1n/8/8/5Q2 w - - 0 1)

Lincoln, Robert A

The Problemist, 2017

8/5K2/6p1/7k/4NR1n/8/8/5Q2

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Kh6
      • 2.Rxh4#
  • Tries
    • 1.Kg7?
      • 1...Sg2
        • 2.Qe2#
        • 2.Qd1#
        • 2.Qf3#
      • 1...Sf3
        • 2.Qxf3#
      • 1...g5
        • 2.Sg3#
        • 2.Sf6#
      • 1...Sf5+!
    • 1.Qe2+?
      • 1...Kh6
        • 2.Rxh4#
      • 1...Sf3!
    • 1.Qg2?
      • threat
        • 2.Qg5#
      • 1...Kh6
        • 2.Rxh4#
      • 1...Sf3
        • 2.Qxg6#
      • 1...g5
        • 2.Qxg5#
      • 1...Sxg2!
    • 1.Qh3?
      • threat
        • 2.Rxh4#
        • 2.Qxh4#
      • 1...Kh6
        • 2.Rxh4#
        • 2.Qxh4#
      • 1...g5!
    • 1.Qb5+?
      • 1...Kh6
        • 2.Rxh4#
      • 1...g5
        • 2.Qxg5#
      • 1...Sf5!
    • 1.Qa1?
      • threat
        • 2.Qh8#
      • 1...Kh6
        • 2.Rxh4#
        • 2.Qh8#
      • 1...Sf5!
    • 1.Qd1+?
      • 1...Kh6
        • 2.Rxh4#
      • 1...Sf3!
    • 1.Qg1?
      • threat
        • 2.Qg5#
      • 1...Kh6
        • 2.Rxh4#
      • 1...Sf3
        • 2.Qxg6#
      • 1...g5
        • 2.Qxg5#
      • 1...Sg2!
    • 1.Qh1?
      • threat
        • 2.Rxh4#
        • 2.Qxh4#
      • 1...Kh6
        • 2.Rxh4#
        • 2.Qxh4#
      • 1...g5!
    • 1.Qf3+?
      • 1...Kh6
        • 2.Rxh4#
      • 1...Sxf3!
  • Keys
    • 1.Qa6!
      • 1...Kh6
        • 2.Rxh4#
      • 1...Sg2
        • 2.Qxg6#
      • 1...Sf3
        • 2.Qxg6#
      • 1...Sf5
        • 2.Qxg6#
      • 1...g5
        • 2.Sg3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(b);P-FLIGHT::R(C),XS(a)
  • Tries
    • Try
      • K(D);P-FLIGHT
      • Vars
        • S(a);N_GUARD::QAB(A),XS(a)
      • Refutation
        • S(a);CHECK
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::R(C),XS(a)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • K(b);P-FLIGHT::R(C),XS(a)
        • S(a);N_GUARD::QAB1(A),XP(c)
        • P(c);::QAR1(A),XP(c)
      • Refutation
        • S(a);XQ(A)
    • Try
      • Q(A);P_PINS(a)
      • Threat
        • DUALS(2)
      • Refutation
        • P(c);
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::R(C),XS(a)
        • P(c);P_SPINP(c)::QAR1(A),XP(c)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • Q(A);
      • Threat
        • QAR(A)
      • Refutation
        • S(a);
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::R(C),XS(a)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • K(b);P-FLIGHT::R(C),XS(a)
        • S(a);N_GUARD::QAB1(A),XP(c)
        • P(c);::QAR1(A),XP(c)
      • Refutation
        • S(a);
    • Try
      • Q(A);P_PINS(a)
      • Threat
        • DUALS(2)
      • Refutation
        • P(c);
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::R(C),XS(a)
      • Refutation
        • S(a);XQ(A)
  • Actual
    • Q(A);
    • Vars
      • K(b);P-FLIGHT,P_SPINP(c)::R(C),XS(a)
      • S(a);N_GUARD::QAB1(A),XP(c)
      • P(c);SBLOCK::S(B)
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