MESON Chess Problem Database

Problem Display
PID: 202598 (3Q4/4K3/B1pN4/8/RbNkPp2/5Pp1/6P1/4B3 w - - 0 1)

ten Cate, Pieter

L'Alfiere di Re, 1923

3Q4/4K3/B1pN4/8/RbNkPp2/5Pp1/6P1/4B3

#2

10 + 5

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kc5
      • 2.Sb7#
      • 2.Qb6#
    • 1...Bc3
      • 2.Sb7#
    • 1...Bxd6+
      • 2.Qxd6#
    • 1...c5
      • 2.Sf5#
      • 2.Sb7#
      • 2.Sf7#
      • 2.Sc8#
      • 2.Se8#
  • Tries
    • 1.Sb2?
      • 1...Kc5
        • 2.Sb7#
      • 1...Ke5
        • 2.Qh8#
      • 1...c5
        • 2.Sdc4#
      • 1...Ke3!
    • 1.Sa5?
      • 1...Kc5
        • 2.Sb3#
        • 2.Sdb7#
      • 1...Ke5
        • 2.Sxc6#
        • 2.Qh8#
      • 1...c5
        • 2.Sdc4#
      • 1...Ke3!
    • 1.Se5?
      • 1...Kc5
        • 2.Sb7#
      • 1...Kxe5
        • 2.Qh8#
      • 1...c5
        • 2.Sdc4#
      • 1...Ke3!
    • 1.Sb6?
      • 1...Kc5
        • 2.Sb7#
      • 1...Ke5
        • 2.Qh8#
      • 1...c5
        • 2.Sdc4#
      • 1...Ke3!
    • 1.Rxb4?
      • threat
        • 2.Sb7#
      • 1...Kc5
        • 2.Sb7#
        • 2.Qb6#
      • 1...Kd3!
    • 1.Qh8+?
      • 1...Kc5
        • 2.Sb7#
        • 2.Bxb4#
        • 2.Qe5#
      • 1...Kd3!
  • Keys
    • 1.Sa3!
      • 1...Ke3
        • 2.Sc2#
      • 1...Kc5
        • 2.Sb7#
      • 1...Ke5
        • 2.Qh8#
      • 1...c5
        • 2.Sdc4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • B(b);N_PINS(H)::QAR(J)+S(H)
    • B(b);CHECK,OGATE,P_SPINB(b),XS(H)::QAR2(J),XB(b)
  • Tries
    • Try
      • S(E);P_PINB(b)
      • Vars
        • K(c);N_PINS(H),N_SPINB(b),S_FLIGHT::S(H)
        • K(c);N_SPINB(b),S_FLIGHT::QAB(J)
        • P(e);N_PINS(H),SBLOCK::QAR(J)+S(H)
      • Refutation
        • K(c);N_SPINB(b),S_FLIGHT
    • Try
      • S(E);P_PINB(b)
      • Vars
        • P(e);N_PINS(H),SBLOCK::QAR(J)+S(H)
      • Refutation
        • K(c);N_SPINB(b),S_FLIGHT
    • Try
      • S(E);P_PINB(b)
      • Vars
        • K(c);N_PINS(H),N_SPINB(b),S_FLIGHT::S(H)
        • K(c);N_SPINB(b),OGATEB,S_FLIGHT,XS(E)::QAB(J)
        • P(e);N_PINS(H),SBLOCK::QAR(J)+S(H)
      • Refutation
        • K(c);N_SPINB(b),S_FLIGHT
    • Try
      • S(E);P_PINB(b)
      • Vars
        • K(c);N_PINS(H),N_SPINB(b),S_FLIGHT::S(H)
        • K(c);N_SPINB(b),S_FLIGHT::QAB(J)
        • P(e);N_PINS(H),SBLOCK::QAR(J)+S(H)
      • Refutation
        • K(c);N_SPINB(b),S_FLIGHT
    • Try
      • R(D);N_SPINS(H),XB(b)
      • Threat
        • QAR(J)+S(H)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(J);CHECK
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • S(E);P_PINB(b)
    • Vars
      • K(c);N_SPINB(b),S_FLIGHT::S(E)
      • K(c);N_PINS(H),N_SPINB(b),S_FLIGHT::S(H)
      • K(c);N_SPINB(b),S_FLIGHT::QAB(J)
      • P(e);N_PINS(H),SBLOCK::QAR(J)+S(H)
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