MESON Chess Problem Database

Problem Display
PID: 201492 (8/5R1K/6Q1/1PBk4/4NpP1/8/1n2P1b1/8 w - - 0 1)

Pater, Karl

L'Alfiere di Re, 1922

8/5R1K/6Q1/1PBk4/4NpP1/8/1n2P1b1/8

#2

8 + 4

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ke5
      • 2.Qf5#
  • Tries
    • 1.Rf5+?
      • 1...Kxe4
        • 2.Rg5#
        • 2.Rh5#
        • 2.Qe8#
        • 2.Qc6#
        • 2.Qe6#
      • 1...Kc4!
    • 1.Rd7+?
      • 1...Ke5
        • 2.Bd4#
        • 2.Qf5#
        • 2.Qe8#
      • 1...Kc4!
    • 1.Qh5+?
      • 1...Kxe4
        • 2.Re7#
        • 2.Qf5#
      • 1...Ke6
        • 2.Re7#
        • 2.Qf5#
      • 1...Kc4!
    • 1.Qg5+?
      • 1...Kxe4
        • 2.Rxf4#
        • 2.Re7#
        • 2.Qf5#
      • 1...Ke6
        • 2.Re7#
        • 2.Qf5#
      • 1...Kc4!
    • 1.Qc6+?
      • 1...Ke5
        • 2.Rf5#
        • 2.Re7#
      • 1...Kc4!
    • 1.Qd6+?
      • 1...Kxe4
        • 2.Rxf4#
        • 2.Re7#
        • 2.Qd4#
        • 2.Qe6#
      • 1...Kc4!
  • Keys
    • 1.Qg8!
      • threat
        • 2.Re7#
      • 1...Bxe4+
        • 2.Rf5#
      • 1...Kc4
        • 2.Rb7#
      • 1...Kxe4
        • 2.Re7#
      • 1...Ke5
        • 2.Re7#
      • 1...Ke6
        • 2.Re7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(d);P-FLIGHT::QAR1(F)
  • Tries
    • Try
      • R(G);CHECK
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • R(G);CHECK
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • Q(F);CHECK
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • Q(F);CHECK
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • Q(F);CHECK
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • Q(F);CHECK
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • Q(F);
    • Threat
      • QAB(F)+R(G)
    • Vars
      • B(b);CHECK,SBLOCK,XS(B)::QAB(F)+R(G),DCHECK
      • K(d);S_FLIGHT::QAB(F)+R(G)
      • K(d);S_FLIGHT,XS(B)::R(G)
      • K(d);P-FLIGHT::R(G)
      • K(d);S_FLIGHT::QAB(F)+R(G),DCHECK
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