MESON Chess Problem Database

Problem Display
PID: 87960 (8/8/4B3/8/3Pkp2/1N2p2K/2P5/4Q3 w - - 0 1)

Gevers, Raymond

The Problemist, 1950

8/8/4B3/8/3Pkp2/1N2p2K/2P5/4Q3

#2

6 + 3

5454 Near Snap 2009
6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kf3
      • 2.Bd5#
    • 1...e2
      • 2.Qxe2#
    • 1...f3
      • 2.Qh4#
  • Tries
    • 1.Kg2?
      • 1...e2
        • 2.Qxe2#
      • 1...f3+!
    • 1.Kh2?
      • 1...e2
        • 2.Qxe2#
      • 1...f3
        • 2.Qh4#
      • 1...Kf3!
    • 1.Kg4?
      • 1...e2
        • 2.Qxe2#
      • 1...f3!
    • 1.Kh4?
      • 1...Kf3
        • 2.Bd5#
      • 1...e2
        • 2.Qxe2#
      • 1...f3!
    • 1.Sc5+?
      • 1...Kf3
        • 2.Bg4#
        • 2.Bd5#
        • 2.Qf1#
      • 1...Kxd4!
    • 1.Qf2?
      • 1...f3
        • 2.Qh4#
      • 1...e2
        • 2.Sd2#
        • 2.Sc5#
        • 2.Qxe2#
      • 1...exf2!
    • 1.Qg3?
      • 1...f3
        • 2.Qh4#
        • 2.Qe5#
        • 2.Qg4#
      • 1...e2
        • 2.Qd3#
      • 1...fxg3!
    • 1.Qd1?
      • threat
        • 2.Sc5#
      • 1...e2
        • 2.Qxe2#
        • 2.Qd3#
      • 1...f3!
    • 1.Qf1?
      • 1...e2
        • 2.Qxe2#
      • 1...f3!
  • Keys
    • 1.Qg1!
      • 1...Kf3
        • 2.Qg2#
      • 1...f3
        • 2.Qg4#
      • 1...e2
        • 2.Sd2#

This anticipates 110751(1954)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 3
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • K(b);N_SPINP(a),S_FLIGHT::B(F)
    • P(a);OGATEB::QAR2(A),XP(a)
    • P(c);OGATEB,SBLOCK::QAR(A)
  • Tries
    • Try
      • K(D);S_FLIGHT
      • Vars
        • P(a);OGATEB::QAR2(A),XP(a)
      • Refutation
        • P(c);CHECK
    • Try
      • K(D);P-FLIGHT
      • Vars
        • P(a);OGATEB::QAR2(A),XP(a)
        • P(c);OGATEB,SBLOCK::QAR(A)
      • Refutation
        • K(b);N_SPINP(a),S_FLIGHT
    • Try
      • K(D);S_FLIGHT
      • Vars
        • P(a);OGATEB::QAR2(A),XP(a)
      • Refutation
        • P(c);
    • Try
      • K(D);P-FLIGHT
      • Vars
        • K(b);N_SPINP(a),S_FLIGHT::B(F)
        • P(a);OGATEB::QAR2(A),XP(a)
      • Refutation
        • P(c);
    • Try
      • S(C);CHECK
      • Refutation
        • K(b);N_SPINP(a),P-FLIGHT,XP(E)
    • Try
      • Q(A);N_PINP(a)
      • Vars
        • P(c);OGATEB,SBLOCK::QAR(A)
      • Refutation
        • P(a);XQ(A)
    • Try
      • Q(A);N_PINP(a)
      • Vars
        • P(a);OGATE::QAB1(A)
      • Refutation
        • P(c);XQ(A)
    • Try
      • Q(A);N_PINP(a)
      • Threat
        • S(C)
      • Refutation
        • P(c);
    • Try
      • Q(A);N_PINP(a)
      • Vars
        • P(a);OGATEB::QAR2(A),XP(a)
      • Refutation
        • P(c);
  • Actual
    • Q(A);N_PINP(a)
    • Vars
      • K(b);S_FLIGHT::QAB1(A)
      • P(c);OGATEB::QAR2(A)
      • P(a);N_GUARD::S(C)
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