MESON Chess Problem Database

Problem Display
PID: 169308 (8/1p6/4K3/8/3pkP2/4qR2/3RQ3/4N3 w - - 0 1)

Simoni, Francesco

Comm., SuperProblem 186. TT, 2017

8/1p6/4K3/8/3pkP2/4qR2/3RQ3/4N3

#2

6 + 4

4901 Best Problems 2018
6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe2
      • 2.Rxe2#
    • 1...d3
      • 2.Qxe3#
  • Tries
    • 1.Sc2?
      • threat
        • 2.Rxd4#
      • 1...d3
        • 2.Qxe3#
      • 1...Qxe2!
    • 1.Sd3?
      • threat
        • 2.Sf2#
        • 2.Sc5#
      • 1...b6
        • 2.Sf2#
      • 1...Qxe2!
    • 1.Rxe3+?
      • 1...dxe3
        • 2.Qf3#
        • 2.Qc4#
      • 1...Kxf4!
    • 1.Qb5?
      • threat
        • 2.Qd5#
        • 2.Qe5#
        • 2.Qf5#
        • 2.Qxb7#
      • 1...Qxf4
        • 2.Qd3#
        • 2.Qd5#
        • 2.Qxb7#
      • 1...Qxe1
        • 2.Qd3#
        • 2.Qd5#
        • 2.Qxb7#
      • 1...Qxf3
        • 2.Qe5#
      • 1...d3
        • 2.Qd5#
        • 2.Qe5#
      • 1...Qc3
        • 2.Qd5#
        • 2.Qe5#
        • 2.Qf5#
      • 1...b6
        • 2.Qc6#
        • 2.Qd5#
        • 2.Qe5#
        • 2.Qf5#
      • 1...Qb3+!
  • Keys
    • 1.Qc4!
      • threat
        • 2.Qd5#
      • 1...Qxf3
        • 2.Qxd4#
      • 1...Qb3
        • 2.Rxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • Q(a);N_SPINQ(a),OGATE,XQ(C)::R(B),XQ(a)
    • P(b);N_GUARD::QAR1(C),XQ(a)
  • Tries
    • Try
      • S(A);
      • Threat
        • R1(B),XP(b)
      • Vars
        • P(b);N_GUARD::QAR1(C),XQ(a)
      • Refutation
        • Q(a);N_SPINQ(a),XQ(C)
    • Try
      • S(A);
      • Threat
        • DUALS(2)
      • Vars
        • P(d);::S(A)
      • Refutation
        • Q(a);N_SPINQ(a),XQ(C)
    • Try
      • R(D);CHECK,XQ(a)
      • Refutation
        • K(c);P-FLIGHT,XP(E)
    • Try
      • Q(C);N_PINQ(a)
      • Threat
        • DUALS(4)
      • Vars
        • Q(a);XR(D)::QAR1(C)
      • Refutation
        • Q(a);CHECK
  • Actual
    • Q(C);N_PINQ(a),P_PINP(b)
    • Threat
      • QAB1(C)
    • Vars
      • Q(a);N_GUARD,XR(D)::QAR1(C),XP(b)
      • Q(a);N_GUARD,P_PINQ(C)::R1(B),XP(b)
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